Gallery became involved in the child welfare agencies of New York City. He then transferred to the University of Scranton, becoming one of the initial members of the university's Jesuit community in 1942.[1] He became a professor of sociology at the university,[2] and served as the chairman of the social studies department.[1] He also was the director and one of the founders of the university's Institute of Industrial Relations, which had branches in Hazelton, Shenandoah, and Scranton.[4] Given his work in the industrial relations field, he was frequently appointed an arbitrator in industrial disputes. He continued to remain involved in child welfare, working with local agencies, and being appointed by two governors of Pennsylvania as the chair of commission on child welfare.[1]
In 1947, Gallery was appointed president of the University of Scranton,[2] succeeding W. Coleman Nevils. Soon after assuming the office, he purchased three surplus Navy barracks, and had them erected on the campus in the fall of 1947, to accommodate the rapid increase in enrollment due to the G.I. Bill. The university's graduate school was established in 1950, awarding degrees in education, business administration, and chemistry. His presidency came to an end in 1953.[1]