2008-2012   Berkeley Quantitative, LLC, Chairman

1998-2012   Space Computer Corporation acquired by Exelis

1992-2010   A K Peters, Ltd acquired by CRC Press

1984-1990 + 1995-2002  Cylink (NASD CYLK) acquired by Safenet in 2002, then acquired by Gemalto in 2014.
                            Audit Committee

1982-1993 IC Designs (became Cypress Timing Technology)

1989-1991 Axcom Trading Advisors, President (now Renaissance Technologies)

1986-1989 Kodak Federal Systems Division

1974-1989 Cyclotomics, President, (became Kodak Berkeley Research)