Williams began performing stand-up comedy in
Wellington in 2007. In 2009 he performed as
Dai Henwood's opening act after winning Dai's Protégé Project. He is a regular performer in the New Zealand Comedy Festival in Wellington and
Auckland. In 2010, he started co-hosting on
The Jono Project, where he appeared on
TVNZ's breakfast show in a prank in which he claimed to be a promoter of commercial whaling in New Zealand as a way to save whales. When the show was merged with
WANNA-BEn in 2012 to form
Jono and Ben at Ten, Williams followed. He was promoted to co-host in 2013. In 2012, Williams won the
Billy T Award for his debut solo show
On the Verge of Nothing. On 15 January 2014, it was announced in a press release that Williams would join
The Edge in a new radio show,
The Edge Afternoons with Guy, Sharyn & Clint, with
Sharyn Casey and
Clint Roberts. In comedic fashion, he is quoted in the press release as saying: "It has been my dream to work on The Edge radio station ever since last week when they told me I would be working on The Edge radio station. I'm super excited to make my dream a reality." In March 2014, Williams was selected by
TV Guide magazine as New Zealand's Sexiest Male Television Personality, beating
Shortland Streets
Benjamin Mitchell, who had won the award for several years beforehand. He also co-hosted
The Xtra Factor, a follow-up programme of
The X Factor with Casey and Roberts from March–May 2015. In June 2015, he began narrating
Come Dine with Me New Zealand. In September 2015, Williams released a charity single entitled "The Pigeon Song", featuring Christchurch rapper
Scribe. It peaked at the number two position in the New Zealand singles chart. In 2016, Williams left The Edge saying he would focus on television projects and other work. He released his first half-hour standup special in 2017, and started hosting the satirical news show
New Zealand Today In December 2024, Williams revealed had been diagnosed with
attention deficit hyperactivity disorder (ADHD) as part of a
TVNZ documentary,
ADHD - Not Just Hyper. The documentary follows Williams, who is diagnosed on camera, and his sister Maria, who was diagnosed in 2022, learning to live with the condition. In 2025, Williams confronted
ACT New Zealand party leader
David Seymour at an impromptu press conference during the
2025 Waitangi Day event regarding the
Treaty Principles Bill. Williams accused Seymour of spreading misinformation by saying Māori were "causing division and racism", a claim which Seymour denied. The exchange was met with divided opinion. == Personal life ==