Thomas Church has been a professor at the University of Delaware's College of Marine Studies since 1972. He is an adjunct and visiting professor at the Univ. Aix-Marseilles and has been a visiting scientist at institutions in Monaco, Nice and India. He has also been a research faculty associate in geochemistry at the California Institute of Technology. Dr. Church and his colleagues have studied the transport of continental pollutants to the Sargasso Sea for more than two decades.