Egon Spengler him, which leaves him a little flustered. He celebrates his 40th birthday during this series, which would put him in his late twenties when "The Real Ghostbusters" began. Age is the largest factor causing Spengler to having transition from active ghost hunting to a mentorship role; in one episode where the original Ghostbusters guest starred on an episode the audience clearly sees middle adulthood has affected the speed and weakened the stamina of the original Ghostbusters. Although Egon Spengler does not appear in the 1990 "The Earth Day Special", his character and status as a Ghostbuster is mentioned, and Harold
John Spengler and strategies, and was a member of Harvard's Greenhouse Gases Executive Committee. He has been an advisor to the World Health Organization on indoor air pollution, personal exposure, and air pollution epidemiology. In 2003, Dr. Spengler received the 9th Annual Heinz Award in the Environment. Ph.D., 1971, State University of New York, Albany John Spengler John Daniel Spengler is an American health scholar currently the Akira Yamaguchi Professor of Environmental Health and Human Habitation at Harvard T.H. Chan School of Public Health and a Faculty member in the Department of Environmental Science and Public Policy of the Faculty of Arts