AT&T Bell Laboratories, Senior Research Associate, 1983-1985
Wesleyan University, Assistant Professor, 1994-2001
Wesleyan University, Associate Professor, 2001-2007
Wesleyan University, Professor, 2007- present
Wesleyan University, Fisk Professor of Natural Science, 2015 – present
Chairperson, Molecular Biology and Biochemistry Department, Wesleyan University, 2005-2008, Fall 2009.
Director of Graduate Studies, Wesleyan University, Jan. 2010 – Sept. 2011
Dean of Natural Sciences and Mathematics, Wesleyan University, Jan. 2012 – June 2015