## Sven Leyffer

Sven Leyffer joined the Mathematics and Computer Science Division at Argonne in 2002, where he is now a computational mathematician. Sven is a SIAM fellow, a senior fellow of the University of Chicago/Argonne Computation Institute, and an adjunct professor at Northwestern University.

He is the current SIAM Vice President for Programs and serves on the editorial board of the SIAM Journal on Optimization, Computational Optimization and Applications, and Computational Management Science; he also is editor-in-chief of Mathematical Methods of Operations Research and the coordinating editor for nonlinear optimization for Mathematical Programming Computation.

In 2006, Leyffer (along with two colleagues) received the Lagrange Prize in Continuous Optimization, which is awarded only once every three years.

Leyffer obtained his Ph.D. in 1994 from the University of Dundee, Scotland and held postdoctoral research positions at Dundee, Argonne, and Northwestern University.

#### Research Interests

- Development of reliable methods for solving large-scale nonlinear optimization problems
- Implementation and analysis of filter-type algorithms
- Extending nonlinear optimization methodologies to emerging areas such as mixed-integer nonlinear optimization and optimization problems with complementarity constraints