Coohill attended Saint Michael"s College at the University of Toronto, where he met his future wife, Patricia Ann Trutty. He received his Doctor of Philosophy in Biophysics at Pennsylvania State University under the tutelage of renowned physicist, Ernest C. Pollard.
He received his master"s degree at the University of Toledo. His first two sons, Joseph and Thomas Junior., were born in Toledo. Coohill has worked in various places: the Medical School at the University of Pittsburgh.
The Pittsburgh Veterans Administration Hospital, Woods Hole Oceanographic Institute, Brookhaven National Laboratory, the Jet Propulsion Laboratory, Western Kentucky University and at Siena College.
He was President of the American Society for Photobiology in 1989. Sigma Xi speaker in 1990-1991.
His speciality is the effects of ultraviolet radiation on cells and viruses. He has published over 100 reviewed articles, book chapters, and books
He is a sought after consultant to industry and governments and has been a featured speaker in over 40 countries.
He has published two novels,The Wolves of Pilovo and The 5th World He has been cited widely in the press (eg New York Times, San Francisco Chronicle, Der Stern) and interviewed twice on National Public Radio. He has appeared numerous times on television An intrepid traveler, he has visited over 100 countries.
Currently he is a member of the Review Committee of the United Nations for the Montreal Protocol on Substances that Deplete the Ozone Layer.
Married Patricia Ann Trutty, September 8, 1962. Children: Joseph, Thomas, Matthew.