He worked as a general manager of the Hong Kong Rugby Football Union from May 2011 until June 2013. He said of his new job that "everywhere you look, we have seen progress. We have to continue to grow the game, but at the same time set realistic goals and objectives". Whilst there he witnessed the first time that rugby players were named on the Hong Kong honours list. He resigned due to the difficulty in moving his family.
Personal life
McMahon is married to Elise and has two children, Connor and Nolan.