• President, LL Pelling Co.
  • Director of Research and Development of Phoenix Industries
  • Korea Institute of Construction Technology
  • Professor, Civil Engineering, Ajou University
  • Executive Vice President of the Asphalt Paving Association of Iowa (APAI)
  • CEO, NH Chemicals, Ltd. & NH Coporation
  • President and CEO of Construction Materials Testing, Inc. (CMT)
  • President, LRK Patent Law Firm


  • Professor, Civil and Environmental Engineering and Public Policy Center, University of Iowa
  • Director, Laboratory for Advanced Construction Technology (LACT)


  • Professor, Materials Science and Engineering, University of Central Florida
  • Professional Engineer, Buchanan County Iowa
  • Associate Professor, Iowa State University
  • Director, Bridge Engineering Center