Alfred Hoblitzelle Clifford (July 11, 1908 – December 27, 1992) was an American mathematician born in St. Louis, Missouri who is known for Clifford theory and for his work on semigroups. He did his undergraduate studies at Yale and his PhD at Caltech, and worked at MIT, Johns Hopkins, and later Tulane University. The Alfred H. Clifford Mathematics Research Library at Tulane University is named after him. Publications External links Alfred H. Clifford Mathematics Research Library 20th-century American mathematicians 1908 births 1992 deaths People from New Orleans Tulane University faculty California Institute of Technology alumni Scientists from Missouri Mathematicians from Missouri