Clark was selected as president and served from March 1975 through mid-1990. During this time he led the school's evolution from primarily a four-year liberal arts college to a research university. Clark added the Anderson Center for the Performing Arts and inaugurated the Summer Music Festival, created the Harpur Forum (now called the Binghamton University Forum), established the Thomas J. Watson School of Engineering and Applied Science, and fostered the expansion and development of the Decker School of Nursing.