Staff at 3AW gave him the nickname "Scoop", a reference to his midday program Radio Roundsman, featuring interviews with people making news around Melbourne.
He also compèred the TAA Hit Parade, a 6:00 pm Sunday program featuring the eight top tunes of the week.
[5] At HSV-7, he compèred a number of variety and quiz shows, the most notable being Tell the Truth and The Penthouse Club.
[6] The latter was co-hosted by Mary Hardy, who later compèred the show with others, including Bill Collins and Ernie Sigley.
[7][8] Williamson retired in 1977 and was awarded the Medal of the Order of Australia in 2006 for his charity work with the Royal Children's Hospital raising money for leukaemia research.