Sure is, not a medical one though.
John Nunn

Wiki says:
Doctorate in 1978 with a thesis on finite H-spaces, and remained at Oxford University as a mathematics lecturer until 1981....

Yes I think he is. He got quite an impressive career there- http://en.wikipedia.org/wiki/John_Nunn

"He is married to Petra Fink-Nunn, a German chess player with the title Woman FIDE Master. They have a son, Michael." at least his wife can play chess, lucky for him.

met him coupla times, though he wuddn know me from Adam, he a nice guy - I has always liked mavericks

Dr John Nunn graduated from Oxford University in 1978 (aged 23) with a Doctorate in Mathematics. He graduated in 1973 aged just 18. He is one bright lad!
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Is John Nunn a doctor ?