question: Rex Ingamells is credited with being the leading light of this Australian literary  movement in what decades
answer: 1930s and 1940s
context: Title: Jindyworobak Movement
  Passage: The Jindyworobak Movement was an Australian literary movement of the 1930s and 1940s whose white members, mostly poets, sought to contribute to a uniquely Australian culture through the integration of Indigenous Australian subjects, language and mythology.  The movement's stated aim was to "free Australian art from whatever alien influences trammel it" and create works based on an engagement with the Australian landscape and an "understanding of Australia's history and traditions, primeval, colonial and modern".
  Title: Rex Ingamells
  Passage: Reginald Charles (Rex) Ingamells (19 January 191330 December 1955) was an Australian poet, generally credited with being the leading light of the Jindyworobak Movement.
  Title: The Great South Land : An Epic Poem
  Passage: The Great South Land : An Epic Poem (1951) is a poem by Australian author Rex Ingamells.  It consists of a sequence of twelve books, with an "Overture" and an epilogue, "The Timeless Covenant".  It won the ALS Gold Medal, and the Grace Leven Prize for Poetry, both in 1951.
  Title: Roy Hasan
  Passage: Roy Hasan (Hebrew: רועי חסן) (born 9 April 1983, in Hadera, Israel) is a leading contemporary Hebrew poet.  An Israeli, he is a leading light of the Ars poetica literary movement.
citations: Rex Ingamells Jindyworobak Movement