Crowley came to the
University of Nevada, Reno in 1966, as a one-semester replacement in the political science department. Upon completing his PhD in 1967, he received a full-time contract as a political science professor at the university. He served in the University Faculty Senate from 1972 to 1973. During an academic leave, Crowley became a fellow with the
United States Environmental Protection Agency in 1973, and served as the director of institutional studies for the National Commission on Water Quality in 1974. In 1976, Crowley became department chair for political science and held that position until February 1978. He served as acting University President from February 24, 1978, until March 23, 1979, when he was appointed to the position permanently. He oversaw a dramatic expansion of the institution, both in size of the campus, as well as significant increases in student and faculty numbers. Crowley helped to establish the university foundation, and complete a major capital campaign. The
University of Nevada, Reno School of Medicine was expanded to a statewide institution, with facilities in established in Las Vegas. The university established a new core curriculum, and widely enhanced sponsored faculty research on campus. The university founded both the College of Human and Community Sciences (known today as the Division of Health Sciences) and of the
Donald W. Reynolds School of Journalism under Crowley's presidency. Also during his tenure, Crowley served on the board of directors of the
National Association of State Universities and Land Grant Colleges (NASULGC). In 1989 he spent as semester as visiting reader at
Brasenose College, Oxford, and chaired the Nevada Rhodes Scholar Committee. From 1993 to 1995, he was president of
National Collegiate Athletic Association and after his presidency there, served as member of its Honors Committee and Minority Opportunities and Interests Committee. In 2006, Crowley authored the book In the Arena: The NCAA's First Century to commemorate the association's centennial. Crowley was also a member of the Collegiate Women's Sports Awards and
National Consortium for Academics and Sports. On May 31, 2000, he announced that he would be stepping down as president. ==Post presidency==