From what we know William Peterson is single.
Connect any celebrity with William Peterson to see how closely they are linked... romantically!
Letter for W.P. in TV Guide:I am a loyal fan and going to see you in "Dublin Carol" in Chicago. I think you play somber, serious characters with great intelligence wonderfully. Is this your favorite sort-of unpretentious character to play? "Substance over dazzle" seems to be your cup of tea. I like that!!