He regularly performs in cabaret at Ronnie Scott's Jazz Club, The Crazy Coqs,[4] The Pheasantry,[5] privately for theatre producer Cameron Mackintosh[6] and with the Syd Lawrence Orchestra.

His most popular show is the interactive Sinatra Jukebox where, "instead of an hour of songs and anecdote, halfway through members of the audience were invited to fill in request forms".

[17] A big band version of the show was aired on Sky Arts on 18th December 2022 [18] with the LP Swing Orchestra and Mica Paris.

[19] In 2022 he made his New York debut at Carnegie Hall as part of a tribute concert to Peggy Lee,[20] staged by the Mabel Mercer Foundation.

Also in 2010 he released Gary Williams Meets Frank Sinatra, recorded with Chris Dean and His Orchestra, which was awarded Jazz FM's album of the week.

Williams has hosted the weekly musical biography show The Legends of Las Vegas[25] for The Wireless by Age UK.

[36] His work has been included in the Picturing High Streets national collection within the Historic England Archive for English Heritage,[37][38][39][40][41][42] exhibited at the Decode Gallery,[43] Trieste Photo Festival,[44][45] published in The New York Times (singer Melissa Errico),[46] ArtDoc Photography Magazine (singer Barb Jungr),[47] printed on the Nicky Haslam “Common Tea Towel” [48] and has had five images officially selected for the International Photography Awards.

[54] [55] [56] In 2008 he was invited to a reception by the Prime Minister's wife Sarah Brown at 10 Downing Street[57] in acknowledgement of his work for The Caron Keating Foundation.