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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.
- Season Four
- Season Five
- Season Six
- Season Seven
- Season Eight