Nick Harris, former senior sound engineer, has become managing director and joint owner of the Soho-based audio post-production house.
His long-time colleague Roger Kelly has also been named business director.
"Taking joint ownership of Tambourine Productions was an obvious choice for me," said Harris. "I want to continue to build on the success of the company."
Harris has been with Tamborine since 2001 and has worked with animators and broadcasters including Disney, BBC, ITV and Blue Zoo.
Kelly's background includes time as a songwriter and performer and founding consulting, engineering and construction form CDM UK.