His departure forms part of the ongoing restructure of BHA services, led by chief executive Paul Bittar.
Earlier this month it was announced that Paul Scotney, Director of Integrity Services, Compliance, and Licensing, would be leaving his full-time role with BHA in December. Tim Morris will finish in his current full-time role with the BHA at the end of January 2013, assisting in the transition and the transfer of his responsibilities.
Paul Bittar, BHA Chief Executive, said: "Reconfiguring the BHA services and structure is an evolutionary process and further work will be done with Tim in the coming weeks to imbed the new structure for veterinary operations combined with our important role in medication control.
"Everyone who knows Tim would acknowledge that he has worked exceptionally hard on behalf of the sport as an advocate of our commitment to horse welfare, and while his departure means a re-focus, it certainly won't impact on our commitment to equine welfare. The ongoing review of the organisation is a difficult process as it impacts people's roles but we've got budget constraints like all other businesses within British Racing, so we're focused on identifying the most effective and efficient structure for the BHA."
Tim Morris said: "I am sad to be leaving my role at the BHA, which has been amongst the most rewarding periods of my career to date but am looking forward to further developing my interests beyond racing. Whilst helping to tackle many external welfare issues may have been the most visible part of my role, I am also deeply proud of my development of the BHA veterinary and technical teams that have enabled these issues to be dealt with."