2005-Present: Visiting Associate in Biology, Caltech Faculty

2005-Present: Caltech Biological Network Modeling Center, Co-Director

2003-2006: Visiting Researcher in Computer Science, UC, Irvine

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

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

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

1989-1990: Computer Scientist, Computer Sciences Corporation

1982-1989: Systems Engineer, Ford Aerospace