Tangi trained as a medical doctor, and was Chief Surgeon in Vaiola Hospital, Nuku'alofa, before moving to Australia. He returned to Tonga after being appointed as Minister of Health. As a Minister, he sat in the Tongan Parliament, but was not an elected representative.
Following democratic reforms in 2010, Dr Tangi contested the 2010 election, but failed to win a seat. On 30 December 2010, he was subsequently appointed a Tongan life peer by King George Tupou V as Lord Tangi of Vaonukonuka.
- "Tonga health minister standing in elections to ensure continuity". Radio New Zealand International. 2010-10-25. Retrieved 2010-10-25.
- "Lord Tangi of Vaonukonuka". Matangi Tonga. 30 December 2010. Retrieved 21 July 2015.
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