Born in Sydney in 1914, Lynn Foster spent her teenage years writing numerous plays, aspiring to be a writer. She would later become an important pioneer in the radio industry, being the first woman in Australia to direct a major radio serial on a national network, as well as the first to write and direct one. She also played a major part in the advancement of the status of writers in the radio industry.
Initially limited by a lack of paid writing opportunities, Lynn Foster was 19 when she was offered a job at the radio station 2UE Sydney after winning second prize in a playwriting competition they had held. While initially only writing small pieces for 2UE, in 1936 she began writing scripts for the BSA Players (for Broadcasting Service Association) production unit, whose programs were broadcast around Sydney on 2GB and 2UE. This writing team became known as the Macquarie Players in 1938, and it was there she honed her skills writing for radio.
Preferring freelance work, Foster wrote for a number of different sponsors during the Second World War (including the play There is No Armour, performed on radio in 1939 and later published in 1945) before becoming the main adaptor of radio scripts from America for Lux Radio Theatre.