· Founder and Chief Scientist, suitX2013–
· Founder and Chief Scientist, Ekso Bionics2005–2009
· Associate Professor, Mechanical Engineering Department, University of California, Berkeley1991–1995
· Professor of Mechanical Engineering, University of California, Berkeley1991–
· Associate Professor, Mechanical Engineering Department, University of Minnesota1989–1991
· Postdoctoral Fellow, Laboratory for Manufacturing and Productivity, Massachusetts Institute of Technology1985–1996
· Assistant Professor, Mechanical Engineering Department, University of Minnesota1985–1989
· Research Assistant, Human-Machine Systems Laboratory, Massachusetts Institute of Technology1980–1985