Passage: Peter Michael Neumann OBE (born 28 December 1940) is a British mathematician. He is a son of the mathematicians Bernhard Neumann and Hanna Neumann and, after gaining a B.A. from The Queen's College, Oxford in 1963, obtained his D.Phil from Oxford University in 1966.

Question: Who is the father of Peter Neumann?
Bernhard Neumann