Williamson was born 4 February 1901 in Ballarat and died 20 December 1985 in Melbourne.
He met Elaine Berkefeld, who became his companion for the remainder of his life.
He spent most of his career with the former Bank of Australasia and following the merger with ANZ rose to the position of general manager of ANZ Bank, a position he held for seven years until his retirement in June 1961.
[3][4][5][6] As general manager, he was responsible for eliminating the fractious attitudes following the merger, smoothing an adversarial relationship with the central bank, mechanizing back office operations, and improving branch efficiencies.
[7] Post-retirement he applied the profits from his extensive investments to support his community interests, which included the Salvation Army and the trust of the Victorian Arts Centre.