My Stanford Ph.D. thesis dealt with how cars crush under impact. Then I worked at the Uniroyal Research Center on tire mechanics, construction, and failures. Over the last ten years I have specialized in reconstructing vehicular accidents based on available physical evidence. I have authored ten related papers and been an active member of the Society of Automotive Engineers Accident Investigation and Reconstruction Practices Committee.

Accident reconstruction tasks have commonly included estimating speeds, times, forces and accelerations; evaluating claims of design and manufacturing defects in tires, brakes, electronic control units, air bags, and seat belts; evaluating claims of roadway or vehicle maintenance problems; developing, using, and evaluating computer programs; evaluating occupant response to rear-enders and roll-overs; and measuring the performance of motorcycles, automobiles, forklifts, golf carts, big rigs, and boats.

Over the last thirty years I have performed numerous mechanical failure investigations involving industrial and consumer products. Many dealt with impacts, vibrations, overturning stability, strength, and long-term loading.

These investigations have involved inspections, mechanical testing, metallurgical evaluations, hand calculations and computer calculations. Objects of the investigations have included chairs, wall shelves, door components, food machinery, stationary dump trucks and cement mixers, assembly line components, ladders, packaging of bottled goods, loading of big rigs, soil foundations, industrial equipment, and accidental flooding.