Mr Tweddell is a senior career officer with the Department of Foreign Affairs and Trade. Mr Tweddell has served as Australian Ambassador to Vietnam; Consul-General, Hong Kong; High Commissioner, Sri Lanka; Deputy High Commissioner to the United Kingdom; and Deputy High Commissioner to India; with earlier postings to Greece and Bangladesh. He was also Chief of Staff to the former Minister for Foreign Affairs, Alexander Downer.
Mr. Tweddell holds Bachelor of Arts and Bachelor of Economics degrees from James Cook University. He is married to Chris and has two sons, Andrew and Paul.