- Chairman of The Walt Disney Studios [December 2013].
- Hosted Salon Seminars at his house, with his wife Cindy Harrell, during the late 1980s, for the USC Institute for the Study of Women and Men in Society.
- President and COO, Warner Bros. Entertainment Inc (October 1999)
- One of the founding members of Castle Rock Entertainment along with Rob Reiner, among others. The company produced such acclaimed films as A Few Good Men (1992) and The Shawshank Redemption (1994). Horn became President & COO of Warners in 1999.
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