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He earned a Master of Laws (LLM) from the Harvard University Law School and has honorary degrees from Marquette University and Marian College in Fond du Lac, Wisconsin.
Rigau has also studied at the Instituto Interamericano de Estudios Políticos in San José, Costa Rica, Harvard University Law School, and New York University Law School.
Born in Madden Station, Laurens County, South Carolina, he attended the public schools and graduated from the University of South Carolina at Columbia in 1928, and from Harvard University Law School in 1931.