Mr Tweddell is a senior career officer with the Department of Foreign Affairs and Trade. Mr Tweddell has served as Australian Ambassador to Vietnam; Deputy High Commissioner to the United Kingdom; Consul-General, Hong Kong; and High Commissioner, Sri Lanka; with earlier postings to India, 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.