good wiki
More at Wikipedia
Alonzo Church
Alonzo Church (June 14, 1903 - August 11, 1995) was an American mathematician, computer scientist, logician, and philosopher who made major contributions to mathematical logic and the foundations of theoretical computer science. He is best known for the lambda calculus, the Church-Turing thesis, proving the unsolvability of the Entscheidungsproblem ("decision problem"), the Frege-Church ontology, and the Church-Rosser theorem.
About