Research Technician, Biochemistry Department, Univ. of Texas Southwestern Medical School at Dallas (l967-l969), under the direction of Dr. John M. Johnston

Medical Technologist, Special Chemistry Laboratory, Parkland Memorial Hospital, Dallas,  Texas (l969-l97l), under the direction of Dr. A.B.C. Dowdey

Graduate Teaching Assistant, North Texas State University, Denton, Texas  (l97l-l973)

Research Associate, Howard Payne University, Brownwood, Texas  (l975-l976)

Postdoctoral Fellow, Texas Christian University, Raman Spectroscopy of Liquid Ammonia Solutions, under the direction of Dr. W.H. Koehler  (l976-l978)

Assistant Professor of Chemistry, Tarleton State University, Stephenville, Texas   (1978-l986)

Associate Professor of Chemistry, Tarleton State University, Stephenville, Texas  (l986-1993)

Professor of Chemistry, Tarleton State University, Stephenville, Texas  (l993-Current)

Department Head, Department of Chemistry and Geosciences, Tarleton State University, Stephenville, Texas  (1994 - 2004)