California Institute of Technology Visiting Associate Invited to do collaborative research in Bioengineering From: June 2014 to September 2014 Harvard Visiting Scholar From: January 2013 to May 2013 Polytechnic Institute of NYU Director, Othmer Institute for Interdisciplinary Research From: July 2003 to July 2005 University of Tokyo Visiting Scholar From: February 1997 to May 1997 The Aerospace Corp. Member of Technical Staff From: February 1990 to May 1990 California Institute of Technology Chevron Distinguished Visiting Professor From: February 1985 to May 1985 Ecole Normale Superieure, Paris 20 Scientist From: March 1972 to September 1973