He received his PhD in the philosophy of religion from Columbia University in 1983. His research interests are focused on comparative and Asian environmental philosophy. He has especially focused on the relationship of Indian spirituality and environmental consciousness. He has published in the International Philosophical Quarterly, in Worldviews, and in Zygon. He has contributed to the Encyclopedia of Religion, the Encyclopedia of Religion and Nature, and the Encyclopedia of Environmental Ethics and Philosophy. He is the author of Interpreting Religion (1995) and editor of Ethical Perspectives on Environmental Issues in India (1998). He has recently completed a monograph concerning the activism and environmental philosophy of the Indian environmentalist, Sunderlal Bahuguna.