Marc is a former Professor of Ecology and Evolutionary Biology at the University of Colorado. With Jane Goodall he founded Ethologists for the Ethical Treatment of Animals. Awards for his research include the Exemplar Award from the Animal Behaviour Society and a Guggenheim Fellowship. His books include the Encyclopedia of Animal Rights and Animal Welfare. In 2005 Marc received The Bank One Faculty Community Service Award for his work with children, senior citizens, and prisoners.