1. Ph.D. Candidate, Zachry Dept. of Civil Engineering, Texas A&M Univ. (TAMU), 501G CE/TTI Bldg, TAMU 3136, College Station, TX 77843-3136; and, Assistant Professor, Dept. of Civil Engineering, Univ. of Magdalena, Edificio Sierra Nevada, Santa Marta, Magdalena, Columbia.
2. Associate Professor, Zachry Dept. of Civil Engineering, Texas A&M Univ. (TAMU), 503F CE/TTI Bldg, TAMU 3136, College Station, TX 77843-3136.
3. Associate Research Engineer, Texas Transportation Institute, 508C CE/TTI Bldg, TAMU 3135, College Station, TX 77843-3135.