| Oct. 2009-Present | Director, Nanotechnology Research and Education Center (NREC), University of South Florida, Tampa, FL |
| Aug. 2005- Present | Professor, Department of Mechanical Engineering, and Nanotechnology Research and Education Center (NREC),), University of South Florida, Tampa |
| Aug. 2009-Present | Affiliated Faculty Member, USF Nanomedicine Research Center, University of South Florida, Tampa, FL |
| Aug. 2007-Present | Program Co-Director, Materials Science & Engineering Program, University of South Florida, Tampa, FL |
| Aug. 2005-Present | Affiliated Faculty Member, Florida Center of Excellence for Biomolecular Identification and Targeted Therapeutics, University of South Florida, Tampa, FL |
| Aug. 2004-Present | Affiliated Faculty Member, Clean Energy Research Center (CERC), University of South Florida, Tampa, FL |
| Aug 2004- Aug. 2006 | Courtesy Visiting Scientist, Shriners Hospital for Children, Tampa, FL |
| Jan. 2000-July 2005 | Associate Professor (Tenured 2002), Department of Mechanical Engineering, and Center for Microelectronics Research, University of South Florida, Tampa, FL |
| May-June 2004 | Visiting Faculty, Institute of Microelectronics, Singapore |
| December 2002 | Visiting Faculty, Nagaoka University of Technology, Nagaoka (Japan) |
| Jan 2000- July 2001 | Adjunct Professor, Department of Electrical and Mechanical Engineering, University of South Alabama |
| Aug.1994- July 2001 | Cluster Director, Alabama NASA EPSCoR (Advanced Materials Program) |
| 2000 (December) | Visiting Faculty, Nagaoka University of Technology, Nagaoka (Japan)
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| Aug.1993- Dec.1999 | Assistant Professor, Department of Electrical and Computer Engineering, University of South Alabama |
| Sept.1992- July1993 | Research Associate Professor, Department of Electrical and Computer Engineering, University of South Alabama |
| Aug.1985- July1986 | Research Scientist, Indian Institute of Technology, Kanpur; INDIA |
