|Parliament of New Zealand|
|1995–1996||Changed allegiance to:||United NZ|
Matthewson was originally a member of the Labour Party, representing the Dunedin West seat. He left Labour in 1995 to jointly establish the United New Zealand party with six other sitting MPs. Matthewson became United's leader, and when the party formed a coalition with the governing National Party in 1996 he was made a Cabinet Minister. In the 1996 election, Peter Dunne was the only United politician to keep his seat, and Matthewson, who had contested the new Dunedin South electorate, did not return to Parliament.
He was the Director of Development and Alumni Relations at the University of Otago from 2002 to 2008, and between 23 July 2004 and 30 September 2008 was on the board of directors for the New Zealand Railways Corporation.
- Young, Audrey (4 February 2008). "Staunch Labourite won't follow Key's suggestion at election". The New Zealand Herald. Retrieved 31 January 2010.
- "Parliament hobbles the party-hoppers". The New Zealand Herald. 20 December 2001. Retrieved 31 January 2010.
- Campbell, Ashley (27 July 2002). "It's a long time in politics". The New Zealand Herald. Retrieved 31 January 2010.
- "Electorate Candidate and Party Votes Recorded at Each Polling Place - Dunedin South" (PDF). Retrieved 2 July 2013.
- Rudd, Allison (25 September 2008). "Gerrard relishes role as university envoy". Otago Daily Times. Retrieved 31 January 2010.
- Graham, Pam (24 July 2004). "Rail board is 'jobs for the boys'". The New Zealand Herald. Retrieved 31 January 2010.
- Cullen, Michael (24 September 2008). "Next step in integrated rail business". New Zealand Government. Retrieved 31 January 2010.
- "2001 Annual Report - Council of the University". University of Otago. Retrieved 31 January 2010.
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