Economist and Harvard Kennedy School faculty member. He became known for his research on the economic implications of immigration policy.
After graduating from St. Peter's College and Columbia University, he taught at the University of Chicago and Queens College, City University of New York.
He held professorships in the economics departments of both the University of California, San Diego and the University of California, Santa Barbara.
A native of Havana, Cuba, he emigrated to the United States at the age of twelve.
He and Milton Friedman both had careers as economists and authors.