Editorial Board member: Journal of Tissue Culture and Bio-Engineering. GAVIN Publishers
2014-Present: Associate Professor. Dalton State College, Department of Natural Sciences. Dalton. GA.
2007-2014: Adjunct Faculty. University of Tampa, Biology Department. Tampa. FL.
2007-2014: Adjunct Faculty. Hillsborough Community College, Biology Department. Tampa. FL.
2004-2005: Post-doctoral Associate. Earth & Environmental Sciences Department. University of Texas at San Antonio, TX.
2000-2003: Post-doctoral Associate. Dept Plant & Microbial Biology. University of California, CA.
1992-2000: Assistant Professor of Plant Biology. Alexandria University, Department of Environmental Sciences, Egypt.
1989-1992: Ph.D. Scholar. Eberhard Karls University, Tübingen, Germany. Deutscher Academischer Austauschdienst.
1981-1989: Lecturer of Plant Biology. Alexandria University, Botany Dept. Egypt.