2009 – Present: Professor of Electrical Engineering, University of Kentucky, Lexington, KY
2007 – Present: KU Professor of Electrical Engineering, University of Kentucky, Lexington, KY
2004 – Present: Associate Professor, Electrical Engineering, University of Kentucky, Lexington, KY
2001 – Present: Associate Director of Center for Nanoscale Science & Engineering, University of Kentucky, Lexington, KY
1999 – 2004: Assistant Professor, Electrical Engineering, University of Kentucky, Lexington, KY
1998: Member of Technical Staff, Bell Laboratories, Lucent Technologies, Orlando, FL
1994 – 1999: Research Assistant, University of Illinois/Urbana-Champaign, Urbana, IL
1993: Teaching and Research Assistant, Southern Illinois University at Carbondale
1987 – 1992: Instructor/Lecturer, University of Electronic Science and Technology (China)