# Positions Held

1987 - present:
Head of Mathematical Modeling and Software Group, NIST.
Research in numerical methods for partial differential equations; development of software for partial differential equations; mathematical modeling of physical systems; computer graphics for scientific visualization.

1979 - present:
Applied and Computational Mathematics Division, NIST.

1973 - 1979:
Computing Science Research Division, Bell Laboratories, Murray Hill, NJ.
Mathematical modeling; research in numerical methods; development of mathematical software.

1966 - 1973:
Semiconductor Device Division, Bell Laboratories, Murray Hill, NJ.
Mathematical modeling applied to semiconductor devices; research and development in numerical methods.