1. Undergraduate Research Assistant, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK.
2. Postdoctoral Research Associate, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK.
3. Graduate Research Assistant, School of Civil Engineering and Environmental Science, Univ. of Oklahoma, Norman, OK.
4. David Ross Boyd Professor, Aaron Alexander Professor of Civil Engineering, Alumni Chair Professor of Petroleum and Geological Engineering, and Director, Southern Plains Transportation Center, Univ. of Oklahoma, Norman, OK.
5. Vice President of Operations, Standard Testing and Engineering, Oklahoma City, OK.