Gerry Ambroisine first joined the Australian Labor Party in September 1969. As a member of the Campsie Branch, he served in a number of capacities: Senior Vice-President, Delegate to the Canterbury Municipal Committee, Canterbury SEC, Lang FEC and Grayndler FEC.
After moving to Engadine, Gerry transferred into his local branch - the Engadine Branch. There he was elected Senior Vice-President and delegate to the Heathcote and Bulli SECs and Hughes FEC.
Following his retirement in 2004, he moved to the Tweed where he joined the Tweed Coast Branch. He is currently the Branch President as well as the President of Tweed SEC and Richmond FEC.
During his time as an ALP Member, he has been a delegate to Annual Conference, State Council and Country Conference. In 2015, he was also a Proxy Delegate to National Conference.
Working in the airline industry in Sydney, Gerry joined the then Australasian Transport Officers' Federation (ATOF). He subsequently gained employment in the NSW Public Service, first with the Housing Commission prior to being appointed as Chairman of the Transport Appeal Boards, a tripartite Tribunal with jurisdiction over State Rail and State Transit employees. The other Tribunal members were nominees of the employing authorities and the relevant Unions.
Gerry was a Public Association Member for many years, during which time he was also a member of the Union's Central Council and a delegate to the NSW Labor Council.
Since 1969, Gerry has participated in all Labor political campaigns, as well as most industrial ones.
He was made a Life Member of the Australian Labor Party (NSW Branch) in 2011.