Esmond G. Ng's Publications

Lawrence Berkeley National Laboratory

National Energy Research Scientific Computing Division

Esmond G. Ng's List of Presentations ...

(Last Updated: February 5, 2001)

Conference Presentations:

"A two-level one-way dissection scheme for finite element problems", Ninth Manitoba Conference on Numerical Math. and Computing, Winnipeg, Manitoba (1979).

"A comparison of some methods for solving sparse linear least squares problems", Tenth Manitoba Conference on Numerical Math. and Computing, Winnipeg, Manitoba (1980).

"Solution of sparse underdetermined systems of linear equations", Sparse Matrix Symposium 1982, Fairfield Glade, Tennessee (Oct. 1982).

"Predicting fill-in in two sparse matrix decompositions", Gatlinburg International Conference on Numerical Linear Algebra, Waterloo, Ontario (Jul. 1984).

"Predicting fill-in in sparse Gaussian elimination with partial pivoting", Minisymposium on Advances in direct methods for solving sparse linear algebraic equations, SIAM 1984 Summer Meeting, Seattle, Washington (Jul. 1984). (Invited)

"Communication reduction in parallel sparse Cholesky factorization on a hypercube", Second Conference on Hypercube Multiprocessors, Knoxville, Tennessee (Sept. 29 - Oct. 1, 1986).

"Solution of sparse positive definite systems on a shared-memory multiprocessor", Numerical Analysis Special Interest Group Meeting, Santa Fe, New Mexico (Oct. 21-23, 1986).

"Panel Discussion: ``Supercomputers and Mathematics Research'', 11th Annual SEAS-SIAM Meeting, Athens, Georgia (Mar. 27-28, 1987). (Invited)

"Direct solution of sparse linear systems on multiprocessors", Minisymposium on Sparse matrix computation on vector and parallel computers, SIAM 35th Anniversary Meeting, Denver, Colorado (Oct. 12-15, 1987). (Invited)

"Direct solution of sparse nonsymmetric linear systems", Gatlinburg International Conference on Numerical Linear Algebra, Fairfield Glade, Tennessee (Oct. 19-23, 1987). (Invited)

"Some aspects of the solution of sparse symmetric positive definite systems on hypercube multiprocessors", Third Conference on Hypercube Concurrent Computers and Applications, Pasadena, California (Jan. 19-20, 1988).

"On the complexity of some sparse matrix factorizations", AMS Sectional meeting, Knoxville, Tennessee (Mar. 25-26, 1988). (Invited)

"On the parallel direct solution of sparse linear systems", Workshop on Methods and Algorithms for PDE's on Advanced Processors, Austin, Texas (Oct. 17-18, 1988). (Invited)

"A comparison of some methods for solving sparse nonsymmetric linear systems", SIAM Symposium on Sparse Matrices, Gleneden Beach, Oregon (May 22-24, 1989).

"Direct solution of sparse linear systems on multiprocessor architectures", Southern Ontario Numerical Analysis Day, University of Waterloo, Waterloo, Ontario, Canada (Apr. 26, 1990). (Invited)

"On finding supernodes for sparse Cholesky factorization", Householder Symposium XI on Numerical Linear Algebra, Halmstad, Sweden (Jun. 18, 1990).

"Algorithms for the direct solution of sparse nonsymmetric linear systems", Workshop on Sparsity in Large Scale Scientific Computation, IBM Europe Institute, Oberlech, Austria (Aug. 6-10, 1990). (Invited)

"Parallel solution of sparse symmetric positive definite linear systems", Conference on Numerical Methods in Engineering Problems, Caracas, Venezuela (Jul. 15-17, 1991). (Invited)

"Sparse Cholesky factorization algorithms, Minisymposium on Direct Sparse Methods", SIAM Conference on Applied Linear Algebra, Minneapolis, MN (Sept. 11-14, 1991). (Invited)

"On the structure of sparse Gaussian elimination with partial pivoting", IMA Workshop on Sparse Matrix Computations, Minneapolis, MN (Oct. 14-18, 1991). (Invited)

"Parallel sparse Cholesky factorization algorithms for shared-memory multiprocessor systems", the 7th IMACS International Conference on Computer Methods for Partial Differential Equations, New Brunswick, NJ (Jun 22-24, 1992). (Invited)

"Sparsity structure in orthogonal factorization", the First Panamerican Workshop for Applied and Computational Mathematics, Caracas, Venezuela (Jan. 11-15, 1993). (Invited)

"Software for symbolic factorization", 14th Annual Meeting of the Canadian Applied Mathematical Society, Toronto, Canada (May 30 - Jun. 2, 1993)

"An evaluation of codes for solving sparse nonsymmetric linear systems", Minisymposium on Direct Methods for Large Sparse Systems, SIAM Conference on Applied Linear Algebra, Snowbird, Utah (Jun. 15- 18, 1994). (Invited)

"An evaluation of codes for solving sparse nonsymmetric linear systems", International Workshop on Sparse Matrix Computations, Saint Girons, France (Jul. 11-15, 1994). (Invited)

"The Computational Mathematics Project at the Oak Ridge National Laboratory", DOE/OSC Applied Mathematics Workshop, Albuquerque, New Mexico (Feb. 27-Mar. 1, 1995).

"On state-of-the-art sparse Cholesky factorization algorithms", 1995 AMS-SIAM Summer Seminar on Numerical Linear Algebra, Park City, Utah (Jul. 31-Aug. 4, 1995). (Invited)

"High-performance sparse Cholesky factorization algorithms", the Fifth Conference of the International Linear Algebra Society, Atlanta, Georgia (Aug. 16-19, 1995). (Invited)

"Direct solution of general sparse linear systems: algorithms, codes, and performance", the CERFACS International Linear Algebra Year Workshop on Direct Methods, Toulouse, France (Sep. 26-29, 1995). (Invited)

"Portable Parallel Preconditioning", ARPA PI's Meeting, San Antonio, Texas (Feb. 13-16, 1996).

"Orderings for Sparse LU and QR Factorizations", Householder Symposium XIII on Numerical Linear Algebra, Pontresina, Switzerland (Jun. 17-21, 1996). (Invited)

"Preconditioning using incomplete factorizations", SIAM 45th Anniversary Meeting, Stanford, California (July 14-18, 1997). (Invited)

"Advances in sparse matrix computations", 15th IMACS World Congress on Scientific Computation, Modelling and Applied Mathematics, Berlin, Germany (August 24-29, 1997). (Invited)

"Greedy ordering heuristics", 15th IMACS World Congress on Scientific Computation, Modelling and Applied Mathematics, Berlin, Germany (August 24-29, 1997). (Invited)

"Developing an efficient hybrid ICCG solver", the Copper Mountain Conference on Iterative Methods, Copper Mountain, Colorado (March 30 - April 3, 1998).

"Performance of greedy ordering heuristics for sparse Cholesky factorization", the AMS Eastern Sectional Meeting, Temple University, Philadelphia, PA (April 4-6, 1998). (Invited)

"Symbolic aspects of sparse orthogonal factorization", Conference on Linear Algenra: Theory, Applications, and Computations, Wake Forest University, Winston-Salem, NC (January 8-9, 1999). (Invited)

"Incomplete Cholesky parallel preconditioners with selective inversion", the 6th International Symposium on Solving Irregularly Structured Problems in Parallel, San Juan, Puerto Rico (April 16, 1999). (Invited)

"Structural results for sparse orthogonal factorization", Minisymposium on Recent Advances in Sparse Matrix Techniques, 1999 SIAM Annual Meeting, Atlanta, GA (May 12-15, 1999). (Invited)

"Re-Revisit ICCG", International Conference on Preconditioning, Minneapolis, MN (June 3-5, 1999).

"NERSC", Partners in Scientific Collaborations, Oak Ridge, TN (August 18-19, 1999). (Invited)

"NERSC", California Climate, Impacts, & Information Workshop, LBNL, Berkeley, CA (October 4, 1999). (Invited)

"The Scientific Computing Group at NERSC", ERSUG Meeting, Portland, Oregon (November 15, 1999). (Invited)

"Advancing Science Through High-Performance Computing", given to DOE Office of Science, Washington, D.C. (November 22, 1999).

"The Scientific Computing Group", given at the DOE Scientific Computing Advisory Council Review, LBNL, Berkeley (March 14, 2000).

"Single-particle Reconstruction Using Supercomputing", Single-particle Reconstruction Workshop at the National Center for Macromolecular Imaging, Houston, TX (April 28-30, 2000). (Invited)

"What's New in Linear Equations Solvers", Workshop on Computational Challenges in Atomic and Molecular Physics, Institute for Theoretical Atomic and Molecular Physics, Harvard University, Mass. (May 4-6, 2000). (Invited)

"The Ordering Problem for Sparse Matrix Factorization", the 16th IMACS World Congress on Scientific Computation, Modelling and Applied Mathematics, Lausanne, Switzerland (August 21-25, 2000). (Invited)

"Linear Algebra and Scientific Discoveries", SIAM Applied Linear Algebra, Raleigh, NC (October 23-25, 2000).

Lectures:

"Row and column orderings in the solution of sparse linear least squares problems", Oak Ridge National Laboratory, Oak Ridge, Tennessee (Aug. 1981).

"On row and column orderings for large sparse least squares problems", Department of Computer Science, University of Toronto, Toronto, Ontario (Oct. 1981).

"Triangular factorization of sparse matrices with row interchanges", Department of Computer Science, Cornell University, Ithaca, New York (Apr. 1984).

"Static implementation of sparse Gaussian elimination with partial pivoting", Oak Ridge National Laboratory, Oak Ridge, Tennessee (Jan. 1985).

"Static implementation of sparse Gaussian elimination with partial pivoting", Department of Computer Science, University of Toronto, Toronto, Ontario (Feb. 1985).

"Recent developments in the implementation of some sparse matrix decompositions", Department of Computer Science, York University, Downsview, Ontario (Feb. 1985).

"Recent developments in the direct solution of sparse nonsymmetric linear systems", Department of Computer Science, The University of Tennessee, Knoxville, Tennessee (Nov. 1986).

"Recent developments in the direct solution of sparse nonsymmetric linear systems", Department of Computer Science, Vanderbilt University, Nashville, Tennessee (Oct. 1, 1987).

"Recent developments in the direct solution of sparse nonsymmetric linear systems", Department of Computer Science, University of Tulsa, Tulsa, Oklahoma (Nov. 23, 1987).

"Recent developments in the direct solution of sparse nonsymmetric linear systems", Department of Mathematics, Oklahoma State University, Stillwater, Oklahoma (Nov. 24, 1987).

"Some ideas in the solution of sparse linear least squares problems", Departments of Computer Science and Mathematics, The University of Tennessee, Knoxville, Tennessee (Feb. 29, 1988).

"Some ideas in the solution of sparse linear least squares problems", Systems Optimization Laboratory, University of Stanford, Stanford, California (Mar. 31, 1988).

"Sparse partial pivoting using static storage schemes", IMSL, Inc., Houston, Texas (Jul. 7, 1989).

"Parallel direct solution of sparse linear systems", Department of Computer Science, University of Alberta, Edmonton, Alberta, Canada (Mar. 12, 1990).

"Parallel direct solution of sparse linear systems", Department of Computer Science, University of British Columbia, Vancouver, British Columbia, Canada (Mar. 14, 1990).

"Algorithms for the direct solution of sparse nonsymmetric linear systems", Institute for Computer Research, University of Waterloo, Waterloo, Ontario, Canada (Apr. 25, 1990). A series of 3 lectures titled "Direct solution of sparse linear systems", Department of Computer Science, Universidad Central de Venezuela, Caracas, Venezuela (Jul. 19-26, 1991).

"Solving linear systems on multiprocessor systems", Department of Computer Science, Radford University, Radford, Virginia (Apr. 20, 1992). A series of 4 lectures on "Sparse matrix computations", Department of Computer Science, Universidad Central de Venezuela, Caracas, Venezuela (Jan. 18-22, 1993).

"Parallel sparse matrix computations", Intevep, Caracas, Venezuela (Jan. 25, 1993).

"Computing row and column counts for sparse Cholesky factorization", IBM Thomas J. Watson Research Center, Yorktown Heights, New York (Jul. 29, 1993).

"Sparse Cholesky factorization algorithms", Electricite de France, Paris, France (Sep. 27-29, 1993).

"Algorithms for the direct solution of sparse nonsymmetric linear systems", Electricite de France, Paris, France (Sep. 27-29, 1993).

"Direct solution of sparse nonsymmetric linear systems", Department of Electrical and Computer Engineering, University of Wisconsin - Madison, Madison, Wisconsin (Oct. 31, 1994).

"High-performance sparse Cholesky factorization algorithms", Sandia National Laboratories, Albuquerque, New Mexico (Jun. 9, 1995).

"High-performance sparse Cholesky factorization algorithms", ETH (Swiss Federal Institute of Technology), Zurich, Switzerland (Oct. 4-6, 1995).

"Sparse Cholesky factorization", Boeing, Bellevue, Washington (Nov. 13, 1995).

"Greedy ordering heuristics", ETH (Swiss Federal Institute of Technology), Zurich, Switzerland (Sept. 3, 1997).

"Scientific computing at ORNL", Old Dominion University, Norfolk, Virginia (Dec. 8, 1997).

"High performance sparse Cholesky factorization", Old Dominion University, Norfolk, Virginia (Dec. 8, 1997).

"The ordering problem for sparse Gaussian eliminations", Emory University, Atlanta, Georgia (Dec. 4, 1998).

"High performance sparse Cholesky factorization", Sun Microsystems, Menlo Park, California (July 19, 1999).

"Ordering sparse matrices", Stanford University, Palo Alto, California (Nov. 29, 1999).

"The ordering problem for sparse matrix factorizations", University of California at Davis, Davis, California (April 13, 2000).

"An Elimination Game", a seminar presented to summer students in the Computing Sciences Directorate, LBNL, Berkeley (June 19, 2000).

"New Ideas For Solving Sparse Nonsymmetric Linear Systems", Weierstrass Institute for Applied Analysis and Stochastics, Berlin, Germany (August 17, 2000).

"New Ideas For Solving Sparse Nonsymmetric Linear Systems", ETH (Swiss Federal Institute of Technology), Zurich, Switzerland (August 29, 2000).

"Scientific Computing at NERSC", Colloquium, Department of Computer Science, University of Kentucky, Lexington, Kentucky (October 16, 2000).

Page URL: http://crd.lbl.gov/~EGNg/talks.html
Page last updated by Esmond G. Ng (EGNg@lbl.gov) on Thursday, 06-Jun-2002 17:05:40 PDT.

Conference Presentations:
	"A two-level one-way dissection scheme for finite element problems", Ninth Manitoba Conference on Numerical Math. and Computing, Winnipeg, Manitoba (1979).
	"A comparison of some methods for solving sparse linear least squares problems", Tenth Manitoba Conference on Numerical Math. and Computing, Winnipeg, Manitoba (1980).
	"Solution of sparse underdetermined systems of linear equations", Sparse Matrix Symposium 1982, Fairfield Glade, Tennessee (Oct. 1982).
	"Predicting fill-in in two sparse matrix decompositions", Gatlinburg International Conference on Numerical Linear Algebra, Waterloo, Ontario (Jul. 1984).
	"Predicting fill-in in sparse Gaussian elimination with partial pivoting", Minisymposium on Advances in direct methods for solving sparse linear algebraic equations, SIAM 1984 Summer Meeting, Seattle, Washington (Jul. 1984). (Invited)
	"Communication reduction in parallel sparse Cholesky factorization on a hypercube", Second Conference on Hypercube Multiprocessors, Knoxville, Tennessee (Sept. 29 - Oct. 1, 1986).
	"Solution of sparse positive definite systems on a shared-memory multiprocessor", Numerical Analysis Special Interest Group Meeting, Santa Fe, New Mexico (Oct. 21-23, 1986).
	"Panel Discussion: ``Supercomputers and Mathematics Research'', 11th Annual SEAS-SIAM Meeting, Athens, Georgia (Mar. 27-28, 1987). (Invited)
	"Direct solution of sparse linear systems on multiprocessors", Minisymposium on Sparse matrix computation on vector and parallel computers, SIAM 35th Anniversary Meeting, Denver, Colorado (Oct. 12-15, 1987). (Invited)
	"Direct solution of sparse nonsymmetric linear systems", Gatlinburg International Conference on Numerical Linear Algebra, Fairfield Glade, Tennessee (Oct. 19-23, 1987). (Invited)
	"Some aspects of the solution of sparse symmetric positive definite systems on hypercube multiprocessors", Third Conference on Hypercube Concurrent Computers and Applications, Pasadena, California (Jan. 19-20, 1988).
	"On the complexity of some sparse matrix factorizations", AMS Sectional meeting, Knoxville, Tennessee (Mar. 25-26, 1988). (Invited)
	"On the parallel direct solution of sparse linear systems", Workshop on Methods and Algorithms for PDE's on Advanced Processors, Austin, Texas (Oct. 17-18, 1988). (Invited)
	"A comparison of some methods for solving sparse nonsymmetric linear systems", SIAM Symposium on Sparse Matrices, Gleneden Beach, Oregon (May 22-24, 1989).
	"Direct solution of sparse linear systems on multiprocessor architectures", Southern Ontario Numerical Analysis Day, University of Waterloo, Waterloo, Ontario, Canada (Apr. 26, 1990). (Invited)
	"On finding supernodes for sparse Cholesky factorization", Householder Symposium XI on Numerical Linear Algebra, Halmstad, Sweden (Jun. 18, 1990).
	"Algorithms for the direct solution of sparse nonsymmetric linear systems", Workshop on Sparsity in Large Scale Scientific Computation, IBM Europe Institute, Oberlech, Austria (Aug. 6-10, 1990). (Invited)
	"Parallel solution of sparse symmetric positive definite linear systems", Conference on Numerical Methods in Engineering Problems, Caracas, Venezuela (Jul. 15-17, 1991). (Invited)
	"Sparse Cholesky factorization algorithms, Minisymposium on Direct Sparse Methods", SIAM Conference on Applied Linear Algebra, Minneapolis, MN (Sept. 11-14, 1991). (Invited)
	"On the structure of sparse Gaussian elimination with partial pivoting", IMA Workshop on Sparse Matrix Computations, Minneapolis, MN (Oct. 14-18, 1991). (Invited)
	"Parallel sparse Cholesky factorization algorithms for shared-memory multiprocessor systems", the 7th IMACS International Conference on Computer Methods for Partial Differential Equations, New Brunswick, NJ (Jun 22-24, 1992). (Invited)
	"Sparsity structure in orthogonal factorization", the First Panamerican Workshop for Applied and Computational Mathematics, Caracas, Venezuela (Jan. 11-15, 1993). (Invited)
	"Software for symbolic factorization", 14th Annual Meeting of the Canadian Applied Mathematical Society, Toronto, Canada (May 30 - Jun. 2, 1993)
	"An evaluation of codes for solving sparse nonsymmetric linear systems", Minisymposium on Direct Methods for Large Sparse Systems, SIAM Conference on Applied Linear Algebra, Snowbird, Utah (Jun. 15- 18, 1994). (Invited)
	"An evaluation of codes for solving sparse nonsymmetric linear systems", International Workshop on Sparse Matrix Computations, Saint Girons, France (Jul. 11-15, 1994). (Invited)
	"The Computational Mathematics Project at the Oak Ridge National Laboratory", DOE/OSC Applied Mathematics Workshop, Albuquerque, New Mexico (Feb. 27-Mar. 1, 1995).
	"On state-of-the-art sparse Cholesky factorization algorithms", 1995 AMS-SIAM Summer Seminar on Numerical Linear Algebra, Park City, Utah (Jul. 31-Aug. 4, 1995). (Invited)
	"High-performance sparse Cholesky factorization algorithms", the Fifth Conference of the International Linear Algebra Society, Atlanta, Georgia (Aug. 16-19, 1995). (Invited)
	"Direct solution of general sparse linear systems: algorithms, codes, and performance", the CERFACS International Linear Algebra Year Workshop on Direct Methods, Toulouse, France (Sep. 26-29, 1995). (Invited)
	"Portable Parallel Preconditioning", ARPA PI's Meeting, San Antonio, Texas (Feb. 13-16, 1996).
	"Orderings for Sparse LU and QR Factorizations", Householder Symposium XIII on Numerical Linear Algebra, Pontresina, Switzerland (Jun. 17-21, 1996). (Invited)
	"Preconditioning using incomplete factorizations", SIAM 45th Anniversary Meeting, Stanford, California (July 14-18, 1997). (Invited)
	"Advances in sparse matrix computations", 15th IMACS World Congress on Scientific Computation, Modelling and Applied Mathematics, Berlin, Germany (August 24-29, 1997). (Invited)
	"Greedy ordering heuristics", 15th IMACS World Congress on Scientific Computation, Modelling and Applied Mathematics, Berlin, Germany (August 24-29, 1997). (Invited)
	"Developing an efficient hybrid ICCG solver", the Copper Mountain Conference on Iterative Methods, Copper Mountain, Colorado (March 30 - April 3, 1998).
	"Performance of greedy ordering heuristics for sparse Cholesky factorization", the AMS Eastern Sectional Meeting, Temple University, Philadelphia, PA (April 4-6, 1998). (Invited)
	"Symbolic aspects of sparse orthogonal factorization", Conference on Linear Algenra: Theory, Applications, and Computations, Wake Forest University, Winston-Salem, NC (January 8-9, 1999). (Invited)
	"Incomplete Cholesky parallel preconditioners with selective inversion", the 6th International Symposium on Solving Irregularly Structured Problems in Parallel, San Juan, Puerto Rico (April 16, 1999). (Invited)
	"Structural results for sparse orthogonal factorization", Minisymposium on Recent Advances in Sparse Matrix Techniques, 1999 SIAM Annual Meeting, Atlanta, GA (May 12-15, 1999). (Invited)
	"Re-Revisit ICCG", International Conference on Preconditioning, Minneapolis, MN (June 3-5, 1999).
	"NERSC", Partners in Scientific Collaborations, Oak Ridge, TN (August 18-19, 1999). (Invited)
	"NERSC", California Climate, Impacts, & Information Workshop, LBNL, Berkeley, CA (October 4, 1999). (Invited)
	"The Scientific Computing Group at NERSC", ERSUG Meeting, Portland, Oregon (November 15, 1999). (Invited)
	"Advancing Science Through High-Performance Computing", given to DOE Office of Science, Washington, D.C. (November 22, 1999).
	"The Scientific Computing Group", given at the DOE Scientific Computing Advisory Council Review, LBNL, Berkeley (March 14, 2000).
	"Single-particle Reconstruction Using Supercomputing", Single-particle Reconstruction Workshop at the National Center for Macromolecular Imaging, Houston, TX (April 28-30, 2000). (Invited)
	"What's New in Linear Equations Solvers", Workshop on Computational Challenges in Atomic and Molecular Physics, Institute for Theoretical Atomic and Molecular Physics, Harvard University, Mass. (May 4-6, 2000). (Invited)
	"The Ordering Problem for Sparse Matrix Factorization", the 16th IMACS World Congress on Scientific Computation, Modelling and Applied Mathematics, Lausanne, Switzerland (August 21-25, 2000). (Invited)
	"Linear Algebra and Scientific Discoveries", SIAM Applied Linear Algebra, Raleigh, NC (October 23-25, 2000).

Lectures:
	"Row and column orderings in the solution of sparse linear least squares problems", Oak Ridge National Laboratory, Oak Ridge, Tennessee (Aug. 1981).
	"On row and column orderings for large sparse least squares problems", Department of Computer Science, University of Toronto, Toronto, Ontario (Oct. 1981).
	"Triangular factorization of sparse matrices with row interchanges", Department of Computer Science, Cornell University, Ithaca, New York (Apr. 1984).
	"Static implementation of sparse Gaussian elimination with partial pivoting", Oak Ridge National Laboratory, Oak Ridge, Tennessee (Jan. 1985).
	"Static implementation of sparse Gaussian elimination with partial pivoting", Department of Computer Science, University of Toronto, Toronto, Ontario (Feb. 1985).
	"Recent developments in the implementation of some sparse matrix decompositions", Department of Computer Science, York University, Downsview, Ontario (Feb. 1985).
	"Recent developments in the direct solution of sparse nonsymmetric linear systems", Department of Computer Science, The University of Tennessee, Knoxville, Tennessee (Nov. 1986).
	"Recent developments in the direct solution of sparse nonsymmetric linear systems", Department of Computer Science, Vanderbilt University, Nashville, Tennessee (Oct. 1, 1987).
	"Recent developments in the direct solution of sparse nonsymmetric linear systems", Department of Computer Science, University of Tulsa, Tulsa, Oklahoma (Nov. 23, 1987).
	"Recent developments in the direct solution of sparse nonsymmetric linear systems", Department of Mathematics, Oklahoma State University, Stillwater, Oklahoma (Nov. 24, 1987).
	"Some ideas in the solution of sparse linear least squares problems", Departments of Computer Science and Mathematics, The University of Tennessee, Knoxville, Tennessee (Feb. 29, 1988).
	"Some ideas in the solution of sparse linear least squares problems", Systems Optimization Laboratory, University of Stanford, Stanford, California (Mar. 31, 1988).
	"Sparse partial pivoting using static storage schemes", IMSL, Inc., Houston, Texas (Jul. 7, 1989).
	"Parallel direct solution of sparse linear systems", Department of Computer Science, University of Alberta, Edmonton, Alberta, Canada (Mar. 12, 1990).
	"Parallel direct solution of sparse linear systems", Department of Computer Science, University of British Columbia, Vancouver, British Columbia, Canada (Mar. 14, 1990).
	"Algorithms for the direct solution of sparse nonsymmetric linear systems", Institute for Computer Research, University of Waterloo, Waterloo, Ontario, Canada (Apr. 25, 1990). A series of 3 lectures titled "Direct solution of sparse linear systems", Department of Computer Science, Universidad Central de Venezuela, Caracas, Venezuela (Jul. 19-26, 1991).
	"Solving linear systems on multiprocessor systems", Department of Computer Science, Radford University, Radford, Virginia (Apr. 20, 1992). A series of 4 lectures on "Sparse matrix computations", Department of Computer Science, Universidad Central de Venezuela, Caracas, Venezuela (Jan. 18-22, 1993).
	"Parallel sparse matrix computations", Intevep, Caracas, Venezuela (Jan. 25, 1993).
	"Computing row and column counts for sparse Cholesky factorization", IBM Thomas J. Watson Research Center, Yorktown Heights, New York (Jul. 29, 1993).
	"Sparse Cholesky factorization algorithms", Electricite de France, Paris, France (Sep. 27-29, 1993).
	"Algorithms for the direct solution of sparse nonsymmetric linear systems", Electricite de France, Paris, France (Sep. 27-29, 1993).
	"Direct solution of sparse nonsymmetric linear systems", Department of Electrical and Computer Engineering, University of Wisconsin - Madison, Madison, Wisconsin (Oct. 31, 1994).
	"High-performance sparse Cholesky factorization algorithms", Sandia National Laboratories, Albuquerque, New Mexico (Jun. 9, 1995).
	"High-performance sparse Cholesky factorization algorithms", ETH (Swiss Federal Institute of Technology), Zurich, Switzerland (Oct. 4-6, 1995).
	"Sparse Cholesky factorization", Boeing, Bellevue, Washington (Nov. 13, 1995).
	"Greedy ordering heuristics", ETH (Swiss Federal Institute of Technology), Zurich, Switzerland (Sept. 3, 1997).
	"Scientific computing at ORNL", Old Dominion University, Norfolk, Virginia (Dec. 8, 1997).
	"High performance sparse Cholesky factorization", Old Dominion University, Norfolk, Virginia (Dec. 8, 1997).
	"The ordering problem for sparse Gaussian eliminations", Emory University, Atlanta, Georgia (Dec. 4, 1998).
	"High performance sparse Cholesky factorization", Sun Microsystems, Menlo Park, California (July 19, 1999).
	"Ordering sparse matrices", Stanford University, Palo Alto, California (Nov. 29, 1999).
	"The ordering problem for sparse matrix factorizations", University of California at Davis, Davis, California (April 13, 2000).
	"An Elimination Game", a seminar presented to summer students in the Computing Sciences Directorate, LBNL, Berkeley (June 19, 2000).
	"New Ideas For Solving Sparse Nonsymmetric Linear Systems", Weierstrass Institute for Applied Analysis and Stochastics, Berlin, Germany (August 17, 2000).
	"New Ideas For Solving Sparse Nonsymmetric Linear Systems", ETH (Swiss Federal Institute of Technology), Zurich, Switzerland (August 29, 2000).
	"Scientific Computing at NERSC", Colloquium, Department of Computer Science, University of Kentucky, Lexington, Kentucky (October 16, 2000).