Patricia Johnson worked as a secretary, editioral assistant and journalist, and acted in productions at the Ensemble Theatre. She lived overseas until 1976 working as a journalist, including ten months in Port Moresby, five years in Spain as correspondent for the Los Angeles Times and as Madrid columnist for the Hollywood Reporter. With Boris Cook she collaborated on Maia Goes to School: The Story of a Little Girl in New Guinea - a children's information book with black and white photos by Cook. After her return to Australia she freelanced as a magazine writer. She was accepted as one of four writers in the 1979/1980 screenwriting course at the Australian Film and Television School. In 1985 she was playwright-in-residence for the Sydney Theatre Company.
Apart from her published plays and a novel, Johnson has contributed short stories to anthologies and magazines. She has also had numerous plays, television, and film scripts produced. Among her television credits are episodes for Kindred Spirits (1984), Dusty (1988), G.P. (1989) and the mini-series Fields of Fire II (1988).