Paul R. Ehrlich is co-founder with Peter H. Raven of the field of coevolution, pursuing long-term studies of the structure, dynamics, and genetics of natural butterfly populations. A special interest of Ehrlich's is cultural evolution, especially with respect to environmental ethics, and he is deeply involved in the Millennium Assessment of Human Behavior (MAHB) which he co-founded with his wife Anne (policy coordinator of the CCB) and Professor Donald Kennedy. He is also a recipient of several honorary degrees.
