Assistant Professor, Computer Science Department, University of Illinois at UrbanaChampaign, 9/1995-8/2001

Associate Professor, Computer Science Department, University of Illinois at UrbanaChampaign, 9/2001-8/2005

Beckman Institute Affiliate, University of Illinois at Urbana-Champaign, 10/1997-Present

Coordinated Science Laboratory Affiliate, University of Illinois at UrbanaChampaign, 1997-present

Visiting Associate Professor, EECS Department, University of California, Berkeley,9/2003-12/2003

Visiting Associate Professor, ECE Department, Technical University Darmstadt,Darmstadt, Germany, 4/2004-6/2004.

Full Professor, Computer Science Department, University of Illinois at UrbanaChampaign, 9/2005 – Present

Research Professor, Information Trust Institute, University of Illinois at UrbanaChampaign, 2006 – Present

Affiliate Full Professor, ECE Department, University of Illinois at UrbanaChampaign, 2009-Present

Visiting Full Professor, ECE Department, Technical University Darmstadt, Germany,
6/2010-12/2010.

Visiting KIVA Professor, ECE Department, Technical University Darmstadt,Germany, July 2013, June 2014.

Co-Founder and Scientific Advisor, 4D Teleport Startup, Champaign, IL, 2010-2013.

Associate Head of Computer Science, University of Illinois at Urbana-Champaign,August 2011-August 2013

Acting and Interim Director of Coordinated Science Laboratory, College of Engineering, University of Illinois at Urbana-Champaign, 8/2013 – 2/2015

Director of Coordinated Science Laboratory, College of Engineering, University of Illinois at Urbana-Champaign, 2/2015 – present