[2] After attending secondary school in Forster and Taree on the North Coast of New South Wales, he studied at the University of Sydney, graduating in law and economics.
He was convenor of the FoE urban campaign which opposed the Sydney City Council's inappropriate high rise development.
Bob Hawke appointed Tickner, in 1990, the Minister for Aboriginal and Torres Strait Islander Affairs; and he retained this post throughout Paul Keating's government.
[8][9][10][3] As of 2024[update] Tickner is co-chair of the EveryAGE Counts Steering Committee, and ambassador for International Campaign to Abolish Nuclear Weapons (ICAN) Australia.
Its Co-Patrons in Chief are former governor generals of Australia Sir William Deane and Dame Quentin Bryce, and patrons include former High Court justice Virginia Bell; former NSW senator Peter Baume; Tim Costello; Olympian and Australian of the Year Robert de Castella; former Liberal MP and ultra-marathon athlete Pat Farmer; author Kate Grenville ; Jackie Huggins; former High Court justice Michael Kirby; playwright Suzie Miller; artist Ben Quilty; Aboriginal elder and activist Pat Turner; former Liberal Minister for Indigenous Australians Ken Wyatt; and many others.