1. Associate Professor, Ira A. Fulton School of Engineering, Arizona State University, P.O. Box 870204, Tempe, AZ 85287-0204.
2. Territory Manager (Asia), Earth Tool Company LLC, P.O. Box 3, Oconomowoc, WI 53066.
3. Executive Director, Balama Prima Engineering Company Limited, 10th Floor, Hing Lung Commercial Building, 68-74 Bonham Strand East, Sheung Wan, Hong Kong.