· Visiting Professor, Columbia University1999–
· Senior Fellow at National Museum of American History, Smithsonian Institution1998–
· Visiting Scholar, Russell Sage Foundation1993–1994
· Visiting Fellow in American Studies, Yale University1992–
· Visiting Scholar in Urban Studies and Planning, Massachusetts Institute of Technology (MIT)1987–1988
· Professor of Sociology, Fordham University1981–
· Dean of General Studies, Fordham University1976–1981
· Head of Department of Puerto Rican Studies and Associate of Sociology Department, Herbert H. Lehman College, CUNY1974–1976
· Research Associate at Centro de Estudios Puertorriqueños, Graduate Center, CUNY1973–
· Instructor, Washington University in St. Louis1970–1971
· Staff Associate in Housing, New York Urban Coalition1969–
· Instructor in English as a Second Language, Centro Colombo-Americano, Cali, Colombia1965–
· Bachelor's degree, City College of the City University of New York
· M.A., Cornell University
· PhD Student, Washington University in St. Louis