He was the University of Florida's second alumnus to serve as its president. His term as president is remembered for the enhancement of the university's instructional quality, the rapid rise of its admissions standards, the growth of its academic reputation, and its successful fund-raising among alumni and the business community. His administration successfully completed the process of the University of Florida's admission to the Association of American Universities (AAU), the leading association of North American research universities, in 1985, and forthrightly handled the football program's widespread violations of National Collegiate Athletic Association (NCAA) rules under coach Charley Pell that shocked the university community during the 1984–1985 academic year. As an experienced lawyer, he supervised the university's own investigation of its football program, disclosed the results to the NCAA, and implemented reforms to ensure the integrity of the university and future compliance with NCAA legislation. Criser was responsible for initiating the university's first comprehensive capital campaign in the fall of 1988. When completed three years later, in 1991, the capital campaign had raised more than $390 million for the university's endowment. At the time, the capital campaign realized the third-highest total of private donations ever raised by an American state university. Criser advocated reducing class sizes to improve the quality of academic instruction, and proposed reducing undergraduate enrollment by 1,500 students while maintaining the size of the university faculty and budget. The next three entering freshman classes were to be reduced by 500 entering students each. He also made plans for raising the university's admissions standards and its upper division retention requirements, bolstering the academic counseling program, and rewarding faculty excellence in instruction, research and academic publishing. The lost income from the smaller entering classes, and the costs of the other academic enhancements, were to be offset by increased investment income resulting from the capital campaign's additions to the university endowment. After resigning as the university president in 1989, Criser returned to the practice of law in Jacksonville, Florida, with the law firm of Mahoney, Adams & Criser, and its successor, McGuire Woods. When the Florida Legislature reorganized the governance system for the state's universities in 2001, Governor Jeb Bush appointed Criser as the founding chairman of the newly constituted board of trustees of the university. He served on the corporate board of directors of Barnett Bank, BellSouth, Florida Power & Light, Rinker Materials and Shands Hospital, and, at the request of Governor Bush, he later served as the chairman of Scripps Florida Funding Corp. He also served as a member of the NCAA Infractions Appeals Committee.