Diego De Leo AO is professor of psychiatry at Griffith University and doctor of science for his research activities in suicidology and psychogeriatrics. He is the director of the Australian Institute for Suicide Research and Prevention, a World Health Organization Collaborating Centre in Suicide Research and Training, as well as the National Centre of Excellence in Suicide Prevention for Australia.

Prof. De Leo has been president of both the International Association for Suicide Prevention and the International Academy for Suicide Research. He is the editor-in-chief of the journal Crisis and the ideator of the World Suicide Prevention Day.

The winner of several international prizes, he has recently be awarded the title of Officer of the Order of Australia.