William Harris, M.D., an E.R. physician, hang glider, sailplane pilot, parachute jumper, and former Big Ten Trampoline Champion, says his toughest challenges come from battling the U.S. Department of Agriculture (USDA) and other dominant forces working against America's good health. In 1998, he wrote The Scientific Basis of Vegetarianism and sent it to every member of the U.S. Congress to "educate them about the adverse effect of animal agriculture subsidies."