William O'Neil "Bill" Callahan was a writer, executive producer, and co-executive producer for Scrubs.


Bill was an Executive Producer/writer on Scrubs. He has been with the show since Season 4 as Co-Executive Producer, and, since Season 6 as an Executive Producer. Callahan has worked with show creator Bill Lawrence on Spin City, another of Lawrence's creations, as co-producer/producer/supervising producer. He also was a writer on 8 Simple Rules and a producer/writer on Oliver Beene. He is the first cousin of John C. McGinley.

The character Billy Callahan (portrayed by Colin Farrell) was named after Bill. ("My Lucky Charm")

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