1. Senior Engineering Associate, Tucson Water, City of Tucson, Tucson, AZ 85726.
2. Design Engineer, Castro Engineering Corp., Tucson, AZ.
3. Associate Professor and Associate Dean, School of Mathematical and Decision Sciences, Central Queensland Univ., Rockhampton, Australia 4701.
4. Associate Professor, Dept. of Civil Engineering and Engineering Mech., Univ. of Arizona, Tucson, AZ 85721.