Bachelor, Ohio State University, 1946. Master of Arts, Ohio State University, 1947. Postgraduate, University Rome, Italy, 1949—1950.
Doctor of Philosophy, University Texas, 1955.
Assistant professor Romance languages and literature, Johns Hopkins University, Baltimore, 1954-1958;
associate professor, U. North Carolina, Chapel Hill, 1958-1961;
associate professor, University of Minnesota, Minneapolis, 1961-1963;
visiting professor, University Texas, Austin, 1963-1964;
professor Romance languages and literature, University Texas, Austin, 1964-1965;
Hinchliff professor Spanish literature, Cornell Univercity, Ithaca, New York, 1965-1969;
director graduate studies in Romance literature, Cornell Univercity, Ithaca, 1966-1969;
professor Spanish literature, Columbia University, New York City, since 1969. Brown Foundation fellow, visiting professor Spanish and comparative literature University of the South, Sewanee, Tennessee, 1990. Visiting professor U. Munich, 1963-1964, U. Berlin, 1967.
Visiting professor U. Greifswald, Germany, since 1991, honorary professor, since 1996. Consultant professor Ohio State University, Columbus, 1967-1969. Visiting lecturer U. Zulia, Maracaibo, Venezuela, 1968.
Director summer seminar National Endowment for Humanities, 1975, consultant, 1975-1977. Visiting scholar Georgia U. Sys., 1977. Visiting research scholar Fondation Hardt, Vandoeuvres, Switzerland, 1959, Herzog August Bibliothek Wolfenbüttel, Federal Repubic Germany, since 1979.
Member committee grants-in-aid American Council Learned Society, 1969-1973. Chairman Comparative Literature Program and Colloquia, Columbia College, 1976-1988.
Member Modern Language Association (secretary, then chairman Romance section 1965-1966, chairman comparative literature 1973, James Russell Lowell prize committee 1989-1990, chairman 1990), International Association Hispanists, American Comparative Literature Association, College Art Association, Academy Literature Studies, American Friends Herzog August Bibliothek (board directors since 1996), Phi Beta Kappa (honorary).