Joanna Murray-Smith, while predominantly a playwright, has also worked as screenwriter, novelist, librettist and newspaper columnist. Murray-Smith's plays have been well-received in Australia and overseas. Honour was first read at the New York Stage and Film Festival in 1995 by Meryl Streep, Sam Waterson and Kyra Sedgwick, and was also produced on Broadway and in San Francisco. Honour has been performed throughout Australia and New Zealand, in Korea, Portugal, Mexico, Turkey, Brazil and Malaysia. Nightfall also had an acclaimed production in 2001 at the New York Stage and Film Festival. Several of Murray-Smith's plays have been adapted for European radio.
Since the early 1960s, Murray-Smith's father and mother led expeditions of family and friends to a remote uninhabited island in Bass Strait, called Erith. Erith is one of three main islands in the Kent Group, half way between the mainland and Tasmania and only accessible by fishing boat. Across from Erith is Deal Island which was inhabited by two lighthouse families who endured the volatile weather of Bass Strait all year. From their island, the Murray-Smiths could look across Murray Pass, the dangerous stretch of water between them and Deal, towards human habitation. At night, the triple beam of the lighthouse was a comfort against the darkness and loneliness of the Strait. In her novel, Judgement Rock (2002), Murray-Smith expresses her gratitude to her parents, Nita and Stephen Murray-Smith (qq.v.), whom she describes as her 'lighthouses'.