- After working with The Doors, Siddons continued his career as a manager in the music industry. He managed or co-managed acts including Crosby Stills Nash & Young; Poco, America, Van Morrison, Pat Benatar, Jerry Cantrell, Robert Palmer, John Klemmer.
- Co-managed Alice in Chains along with the band's original manager, Susan Silver, from 2005 to 2007.
- When Jim Morrison died in Paris on July 3, 1971, Pamela Courson (Morrison's girlfriend) immediately contacted Siddons. He flew to Paris and arranged the funeral and burial with Courson. However, he never saw Morrison's body due to there being a closed casket and his aversion to seeing his friend dead.
- Was a co-founder of Core Entertainment.
- Began his career as a teenage roadie with The Doors while attending Cal State Long Beach and six months later was asked to be the manager of the band in 1968.
- Currently runs Core Entertainment Org., and is partners with Jeremy M. Rosen Esq. in RoxCore Management, representing Ace of Base, Ozomatli, and Matisyahu.
- Core Entertainment was a professional management firm representing Alice in Chains, another band which has dealt with the death of its front man, and others.
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