Graduated from the National Institute of Dramatic Art in 1983. Twice nominated for a best actress AFI award. First in 1986 with For Love Alone & again in 2003 for Alexandra's Project. For her work in Alexandra's Project Buday was awarded Best Actress at the 48th Valladolid International Film Festival, 2003. She was also nominated for Best Actress for the Film Critic's Circle and IF Awards in 2003.
Helen has worked with Australian director Rolf de Heer twice first appearing in Dingo alongside Miles Davis and Colin Friels in 1990 & then again in 2003 with Alexandra's Porject co-starring Gary Sweet.
In 1984 Buday made her screen debut opposite Mel Gibson and Tina Turner, as Savannah Nix, leader of the feral children, in Kennedy-Miller's Mad Max III - Beyond Thunderdome. After a two-and-a-half year search Buday was chosen to play the lead role of Theresa in the film adaptation of Christina Stead's famous novel For Love Alone.
Helen's theatre credits include: A Midsummer's Night Dream (Sydney Theatre Company), The Three Sisters (Anthill Theatre), The Importance of Being Ernest (Melbourne Theatre Company) and The Doll's House (Belvoir Street Theatre), Macbeth (playing Lady Macbeth) for the Sydney Theatre Company, The Marriage Of Figaro for Company B, My Fair lady for The Victorian State Opera, Cabaret for The State Theatre Company of South Australia, High Society for the Melbourne Theatre Company and The Threepenny Opera for the Sydney Theatre Company.