John Tilemann is a former Australian diplomat with extensive experience in nuclear and other international security policy issues.  He represented Australia at a variety of international forums including Nuclear Non-Proliferation Treaty Review Conferences, the Proliferation Security Initiative, the ASEAN Regional Forum, and export control regimes including the Australia Group, the Nuclear Suppliers Group and the Wassenaar Arrangement. In Vienna, he was Australia’s Deputy Permanent Representative to the International Atomic Energy Agency (IAEA) and was subsequently seconded as chief of staff to IAEA Director Generals Dr Hans Blix and Dr Mohamed ElBaradei.  He served as Australia’s ambassador to Jordan 2002-2006 and previously was posted in Thailand, Sri Lanka, Pakistan, and Poland. He was Research Director of APLN from 2016-2019 and has subsequently collaborated with UNITAR in teaching post graduate courses on diplomacy and multilateral negotiations.