For ten points, identify this English mathematician who led the e ort to break the German Enigma code.
This man's work in mathematical biology included his paper  The Chemical Basis of Morphogenesis . This man introduced the method of LU decomposition to solve matrix equations, and also developed a system for the encryption of voice-based communications. His PhD dissertation, Systems of Logic Based on Ordinals, introduced the concept of an oracle machine. He was o cially   pardoned by Queen Elizabeth in 2014, and he developed the Banburismus procedure to aid his work in cryptanalysis. His paper  Computing Machinery and Intelligence  introduced his namesake  test . For ten points, identify this English mathematician who led the e ort to break the German Enigma code.
This man's work in mathematical biology included his paper  
Alan Mathison Turing