2000-Present: Robinson Chair Professor, Department of Electrical and Computer Engineering, University of Kentucky
June 2007-June 2013, and July 2001-June 2005: Director, Center for Nanoscale Science and Engineering (CeNSE), University of Kentucky
2000-2007: Chairman, Department of Electrical and Computer Engineering, University of Kentucky
1993-1999: Schellenger Chair Professor and Director, Electronic Devices Laboratory, Department of Electrical and Computer Engineering, Univ. of Texas at El Paso
1990-1999: Professor, Department of Electrical and Computer Engineering, Univ. of Texas at El Paso
1983-1990: Associate Professor of Electrical and Computer Engineering, Univ. of Texas at El Paso
1983-1985: President, Photon Energy Inc, El Paso, TX
1981-1983: Manager of Materials and Device Research, Photon Power Inc
1980-1981: Section Head of Device Development, Photon Power Inc
1976-1980: Research Engineer, Photon Power Inc
1974-1976: Associate Scientist, Institute of Energy Conversion, University of Delaware
1970-1973: Research Assistant, Department of Electrical Engineering, University of Minnesota
1968-1970: Teaching Assistant, Department of Electrical Engineering, University of Minnesota
Ph.D. Electrical Engineering, University of Minnesota, Minneapolis
M.S. Electrical Engineering, University of Minnesota, Minneapolis
B.S. Electrical Engineering, Indian Institute of Technology (I.I.T.)-Delhi, India
CdS-CdTe Solar Cells
Electroluminescence
Electronic Devices
MNCNT Sensors
Nanotechnology
Nanowires
Photovoltaic Devices
Semiconductors
Sensors
Thin Film Solar Cells