He was the Country Liberal Party member for Sanderson in the Northern Territory Legislative Assembly from 1983 to 2001.
[3] After retiring from politics in 2001, Manzie worked as a volunteer presenter on the morning show of community radio station 104.1 Territory FM.
[5] Manzie was appointed in 2017 as Chair to the NT Committee and to the National Board of the Duke of Edinburgh's International Award – Australia.
[6] In 2010, Charles Darwin University conferred Manzie with a Doctor of Letters, Honoris Causa.
[2] In the 2018 Queen's Birthday honours, Manzie was made a Member of the Order of Australia.