Professional Experience
 | 1991-present Professor, Computer Science Department, University of North Texas, Denton, Texas |
| 2003-2007 Associate Dean of Research, College of Engineering, University of North Texas, Denton, Texas |
| 1984-91 Associate Professor, Computer Science Department, University of North Texas, Denton, Texas |
| 1986-87 University Resident Research Professor, Brooks Air Force Base, San Antonio, Texas |
| 1980-84 Assistant Professor, Computer Science Department, University of North Texas, Denton, Texas |
| 1979-80 Assistant Professor, Computer Science Department, East Texas State University, Commerce, Texas |