Background
Seath was born in Musselburgh, Scotland.
Seath was born in Musselburgh, Scotland.
University of Edinburgh.
He received his education at Waihi District High School, Waihi School of Mines, and the University of Edinburgh. From 1937, he was a public accountant in Taumarunui. During World World War II, he was with the Royal New Zealand Naval Volunteer Reserve (RNZNVR), and served as Lieutenant Commander with British naval forces.
He was Mayor of Taumarunui from 1953 to 1955.
In 1960 Seath was appointed as Parliamentary Under-Secretary to the Minister of Finance, and held that position from 12 December 1960 to 24 January 1962. In 1963 Seath was appointed as Minister of Internal Affairs, and held the position from 20 December 1963 to 9 February 1972, when the Marshall Ministry replaced the second Holyoake Ministry.
In 1972 Seath was granted the right to retain the title of Honourable for life. He retired at the 1972 election, and died in Taumarunui in October 1997.
He was a Member of the Executive Council (initially as an Undersecretary) from 24 January 1962 to 9 February 1972.
He was described as a nervous man easily frightened by Holyoake.