David writes policy papers and speaks on energy efficiency, renewable energy, nuclear power and climate change policy. He also does similar work on water quality and public health policy in the state, especially around animal agriculture.
He is a former Iowa state representative who chaired the House Energy and Environmental Protection Committee as well as the Agriculture Committee. He was the Democratic candidate for U.S. Senate in 1998 and worked as climate change consultant at the Iowa Department of Natural Resources. David holds an M.S. in water resources management and another in agricultural economics from the University of Wisconsin-Madison. He is professor emeritus in the Department of Occupational and Environmental Health at the University of Iowa.
David stopped running when his knees gave out but still walks and bikes in Iowa and around the world. He also reads and has a large garden.