The Science and Life of William Bateson
I just ordered a copy of the following biography about William Bateson who coined the term epistasis.
Cock, A.G., Forsdyke, D.R. Treasure Your Exceptions: The Science and Life of William Bateson. Springer (2008). [Amazon]
There is a nice review of this book by Wade in Evolution.
Wade MJ. Williams Bateson: Variation, heredity, and speciation. Evolution, in press (2009). [PubMed]