2005-Present: Director, Caltech Biological Network Modeling Center

1999-Present: Mathematics Instructor, California State University, Northridge

2005-2009: Visiting Associate in Biology, Caltech Faculty

1999-2009: Senior Member, Technical Staff JPL Machine Learning Group

1990-1999: Member of the Technical Staff, JPL Navigation Systems Section

1989-1990: Computer Scientist, Computer Sciences Corporation

1982-1989: Systems Engineer, Ford Aerospace