1. Corporate Vice President and Principal, Exponent, Inc., 3401 Market Street, Suite 300, Philadelphia, PA 19104, US
2. Research Professor, Drexel Univ. 3141 Chestnut Street, Philadelphia, PA 19104, US.
3. Senior Managing Engineer, Exponent, Inc., 3401 Market St., Suite 300, Philadelphia, PA 19104, US.
4. Senior Managing Scientist, Exponent, Inc., 149 Commonwealth Dr., Menlo Park, CA 94025, US.
5. Director, Orthopedic Research Laboratories, 2310 Superior Ave. East, Cleveland, OH 44114, US.
6. Associate Professor and Vice Chair, Dept. of Orthpaedic Surgery, Phillip R. Lee Institute for Health Policy Studies, Univ. of California, San Francisco, 500 Parnassus, MU 320W, San Francisco, CA 94143, US.