The Office of Population Research at Princeton University is the oldest population research center in the United States. Founded in 1936, the OPR is a leading demographic research and training center. Recent research activity has primarily focused on healthcare, social demography, urbanization, and migration. The OPR's research has been cited in n…The Office of Population Research at Princeton University is the oldest population research center in the United States. Founded in 1936, the OPR is a leading demographic research and training center. Recent research activity has primarily focused on healthcare, social demography, urbanization, and migration. The OPR's research has been cited in numerous articles by the New York Times and the Wall Street Journal.