After completing surgical training overseas he became the second Tongan national admitted to the Royal Australasian College of Surgeons.
[2] He worked as Chief Surgeon in Vaiola Hospital, Nuku'alofa, before moving to Australia.
[2] Following democratic reforms in 2010, Tangi contested the 2010 election,[3] but failed to win a seat.
On 30 December 2010, he was appointed a Tongan life peer by King George Tupou V as Lord Tangi of Vaonukonuka.
[2] Following the 2021 Tongan general election, he was appointed interim Speaker.