I am a computational mathematician in the Mathematics and Computer Science Division at Argonne National Laboratory, and a Fellow of the Computation Institute. I am interested in the development of reliable methods for solving large-scale nonlinear optimization problems and in the implementation and analysis of filter type algorithms. This forms the basis from which I am extending nonlinear optimization methodologies to emerging areas such as mixed-integer nonlinear optimization and optimization problems with complementarity constraints.

http://wiki.mcs.anl.gov/NEOS/index.php/NEOS_Wiki
**Contact:**

Sven Leyffer (see my google calendar for busy times)

Mathematics and Computer Science Division

Argonne National Laboratory

Argonne, Il 60439, USA

E-mail: leyffer at mcs.anl.gov

Phone: (630) 252-4698; Fax: (630) 252-5986