Rivera was very active in each community he lived in. A memorial letter from the University of California, on behalf of the Regents, states that he had "a strong voice in both the nation and the community in recognizing that our youth is a resource beyond measure". He served on many distinguished advisory committees such as the Carnegie Foundation for the Advancement of Teaching, the American Association for Higher Education, the American Council on Education, the President's Commission on a National Agenda for the 80s and the National Commission on Secondary Schooling for Hispanics.