Aaron Gellman, a former adjunct professor at the Wharton School, died on January 11 of multiple organ failure in JourneyCare Hospice in Glenview, Illinois. He was 85 years old.

Dr. Gellman earned his bachelor’s degree in economics from the University of Virginia. He attended the University of Chicago, then entered the US Army in 1951. He then attended the Massachusetts Institute of Technology from 1954-1957 and completed his PhD in 1968.

He was an adjunct professor at the Wharton School at Penn starting in the department of regional sciences and transportation in 1968. He became a lecturer and then a professor in that department. In 1984, he was a member of the graduate group for the newly established master of science in transportation based in Penn’s School of Engineering & Applied Science (Almanac January 31, 1984).

He later directed the Transportation Center at Northwestern University and served on the Northwestern faculty from 1992-2014.

Dr. Gellman is survived by three sons, Samuel, Alexander and Daniel; Sheila Goldberg; and seven grandchildren.