He is the younger brother of former Parramatta Eels, Sydney Roosters, North Queensland Cowboys and Cronulla-Sutherland Sharks winger, John Williams.

Due to a hip flexor injury to teammate Brent Tate, Williams was chosen to play in the World Cup final against New Zealand on 22 November 2008.

He played on the wing in Manly's 28–20 win over the Leeds Rhinos at Elland Road in the 2009 World Club Challenge match on 1 March.

The Wolfman enjoyed a stellar year in 2013 for Manly-Warringah club and finished the minor round as the seasons equal leading try scorer having crossed for 19 tries.

In the second half, Williams failed to kick the ball dead as roosters player Michael Jennings raced past him to score the winning try.

Williams made his acting debut in 2013 in Tropfest short film finalist Darkness Comes in which he plays a wolf man.