Philip Haig Nitschke (/ˈnɪtʃkɪ/; born 8 August 1947) is an Australian humanist, author and founder and director of the pro-euthanasia group Exit International. He campaigned successfully to have a legal euthanasia law passed in Australia's Northern Territory and assisted four people in ending their lives before the law was overturned by the Government of Australia. Nitschke says he was the first doctor in the world to administer a legal, voluntary, lethal injection.