He practices exclusively public interest law, representing national, state, and local environmental groups in Clean Water Act, Clean Air Act, Endangered Species Act, and Resource Conservation and Recovery Act lawsuits. His cases have involved oil refineries, chemical plants, paper mills, sewage treatment plants, fish farms, military installations, textile plants, and hydroelectric dams, among other facilities. He has also brought cases challenging the constitutionality of state laws that endanger wilderness areas and wildlife. He is a graduate of Amherst College and New York University School of Law. Dave worked for the National Environmental Law Center from 1991-2003.