- Before he played the parent of a son with Down syndrome on Life Goes On (1989), Bill actually taught high school students with Down syndrome.
- In 1993, he received the Michael Landon Humanitarian Award for his work with the Down Syndrome Congress, and then in 1996 he served on the executive board of the International Special Olympics committee in his home state of Connecticut.
- He and wife Shaw Purnell have two children, A.J. and Maya.
- Frequently collaborates with Michael Mann.
- Studied acting with Michael Howard in New York City.
- He is of Polish descent.
- Appeared in three movies with William H. Macy: Without a Trace (1983), Ghosts from the Past (1996) and Air Force One (1997).
- He is left-handed.
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