Between 1966 and 1975, 100,000 scientists and engineers emigrated to the U.S. Of these, 62,000 entered as permanent immigrants and the remainder as temporary visitors, subsequently changing their status to become permanent immigrants. This report summarizes the trends of scientist and engineer (S/E) immigration of the 1966-75 time period and relates these trends to economic factors. The data indicate there has been two distinct patterns of immigration; between 1966 and 1972 immigrants came at the rate of about 11,500 per year, while in the 1973-1975 period, the inflow was 6,500 yearly. Reasons for the immigrants coming to the U.S., impact of immigration policies, and data regarding continents of origin and occupational fields are discussed. Data on foreign students in the U.S. are included. (RH)