Born 1953 in Providence. Moved to Champaign IL, Alexandria VA, Arlington VA, Lexington MA, Chevy Chase MD and Cambridge, MA. Spent a year in Isael. Went to Brown for 3 degrees. Studied, mechanics, friction and earthquakes. Taught at Cornell in Theoretical and Applied Mechanics since Aug 25, 1980. Maried to Saskya van Nouhuys since May 15, 1993. Two daughters: Mieke (born 1993) & Prachi (born 2001).