 He first became known for his search for surviving Tasmanian tigers or thylacines, the last known specimen of which died in captivity in 1936.The search conducted from 1967 to 1973, included exhaustive surveys along Tasmania's west coast; installation of automatic camera stations; prompt investigations of claimed sightings; and, in 1972, the creation of the Thylacine Expeditionary Research Team with Bob Brown, which concluded without finding any evidence of the animal's continuing existence.Griffith began writing on the human condition in 1975, publishing the first of his six books on the subject in 1988.