P. Bochev, C. Siefert, R. Tuminaro, J. Xu and Y. Zhu. Compatible Gauge Approaches for H(div) Equations. Technical Report, SAND 2007-5384P, Sandia National Laboratories, August 2007.

P. Bochev, J. Hu, C. Siefert and R. Tuminaro. An Algebraic Multigrid Approach Based on a Compatible Gauge Reformulation of Maxwell's Equations. SIAM Journal on Scientific Computing Volume 31, Issue 1, pp. 557-0583, 2008.

M. Gee, C. Siefert, J. Hu, R. Tuminaro and M. Sala. ML 5.0 Smoothed Aggregation Users Guide. SAND2006-2649, Sandia National Laboratories, May 2006.

C. Siefert. Preconditioners for Generalized Saddle-Point Problems. PhD Thesis, Department of Computer Science, UIUC, January 2006.

C. Siefert and E. de Sturler. Probing Methods for Saddle-Point Problems. Electronic Transactions in Numerical Analysis (ETNA), Special Volume on Saddle Point Problems: Numerical Solution and Applications, Volume 22, pp. 163--183, April 2006.

C. Siefert and E. de Sturler. Preconditioners for Generalized Saddle-Point Problems. SIAM Journal on Numerical Analysis, Volume 44, Number 3, pp. 1275--1296, 2006.

C. Siefert, V. Torczon and M.W. Trosset. Model-Assisted Pattern Search Methods for Optimizing Expensive Computer Simulations. Proceedings of the Section on Physical and Engineering Sciences, American Statistical Association, 2002.

J. Liesen, E. de Sturler, A. Sheffer, Y. Aydin and C. Siefert. Efficient Computation of Planar Triangulations. Proceedings of the 10th International Meshing Roundtable, Newport Beach, CA, October 7-10, 2001.

C. Siefert. Model-Assisted Pattern Search. Undergraduate Honors Thesis, Accepted with Highest Honors, Department of Computer Science, College of William and Mary, May 2000.

Partitioning for Multigrid Solvers - Invited Talk at the Workshop on Combinatorial Scientific Computing and Petascale Simulations (CSCAPES) [Santa Fe, NM], (June 2008)

Recent Algorithmic (and Practical) Developments in ML - Talk at the 10th Copper Mountain Conference on Iterative Methods [Copper Mountain, CO], (April 2008).

Introduction to Multilevel Solvers for the Physical Sciences - Invited CSUMS Lecture, College of William and Mary [Williamsburg, VA], (December 2007).

Algebraic Multigrid and a Compatible Gauge Reformulation of Maxwell's Equations - Invited Computer Science Seminar, College of William and Mary [Williamsburg, VA], (November 2007).

What's New in ML? New Features in Trilinos 8.0 - Trilinos Users Group Meeting 7006 [Albuquerque, NM], (November 2007).

Algebraic Multigrid and Algebraic Reformulations of the Eddy Current Equations, Part II - Talk at the 13th Copper Mountain Conference on Multigrid Methods [Copper Mountain, CO], (March 2007).

Algebraic Multigrid and Algebraic Reformulations of the Eddy Current Equations - Invited Talk for CSE 2007 [Costa Mesa, CA], (February 2007).

What's New in ML? New Features in Trilinos 7.0 - Trilinos Users Group Meeting 2006 [Albuquerque, NM], (November 2006).

AMG and a Discrete Reformulation for Maxwell's Equations - Computer Science Research Institute Seminar [Albuquerque, NM], (October 2006).

Probing Methods for Generalized Saddle-Point Problems - Talk at Preconditioning 2005 [Emory University, GA], (May 2005).

Generalized Saddle-Point Preconditioners and Approximate Schur Complements - Talk at CSE 2005 [Orlando, FL], (February 2005).

Preconditioners for Generalized Saddle-Point Problems - Talk at Midwest Numerical Analysis Day 2004 [UW-Milwaukee, WI], (April 2004).

Preconditioners for Generalized, Stabilized Saddle-Point Problems - Contributed Talk at Preconditioning 2003 [Napa, CA], (October 2003).

Model-Assisted Pattern Search Methods for Optimizing Expensive Computer Simulations - Topic Contributed/Invited Talk at JSM 2002 [NYC], (August 2002).

MAPS: An algorithm for non-parametric Response Surface Methodology - Poster at SRCOS/ASA Conference (with A. Padula, V. Torczon and M. Trosset) [Williamsburg, VA], (Summer 2000).

Model-Assisted Pattern Search - Invited Talk at Sandia National Laboratories [Livermore, CA], (August 2000).

Model-Assisted Pattern Search - Invited Talk for the William and Mary Board of Visitors [Williamsburg, VA], (Spring 2000).

Scalability Consequences in Multi-material Modeling - Conference/Workshop on Numerical Methods for Multi-material Fluid Flows, Czech Technical University, [Prague, Czech Republic] (September 2007), by A. Robinson.

Algebraic Multigrid and Algebraic Reformulations of the Eddy Current Equations, Part I - 13th Copper Mountain Conference on Multigrid Methods [Copper Mountain, CO], (March 2007), by R. Tuminaro.

Goal Oriented Reduced Order Modeling in Structural Dynamics - Adaptive Model Reduction Methods for PDE Constrained Optimization, Rice University [Houston, TX], (April 2006), by R. Lehoucq.

Probing for Schur Complements and Preconditioning Generalized Saddle-Point Problems - Optimization Technology Center and Northwestern University [Evanston, IL], (October 2004), by E. de Sturler.

Preconditioners for Generalized Saddle-Point Problems - Department of Computer Science, University of Maryland [College Park, MD], (December 2004), by E. de Sturler.

Preconditioners for Generalized Saddle-Point Problems - Solution Methods for Saddle-Point Systems in Computational Mechanics Workshop, [Santa Fe, NM], (December 2003), by E. de Sturler.

Model-Assisted Pattern Search - First International Workshop on Surrogate Modelling and Space Mapping for Engineering Optimization, [TU Denmark], (November 2000), by V. Torczon.