After winning the Billy T Award in 2010, Mathewson dropped out of the University of Auckland (but continued to write a column, "Rhys's Pieces", for the student magazine Craccum).
Career
Mathewson was awarded Best Newcomer at the New Zealand International Comedy Festival for his first solo show in 2009, The Best $18 You'll Ever Spend. He performed at Edinburgh Fringe in 2009 and 2013.
Mathewson won the Billy T Award in 2010 for his show Rhyspect— becoming the award's youngest-ever winner at 19 — and the Fred Award in 2016 for Nouveau Rhys.
He was also a fill-in host on and wrote for The Project, and is a writer on Guy Montgomery's Guy Mont-Spelling Bee. In 2026, Mathewson appeared on series7 of Taskmaster New Zealand.
As of 2026[update] he is represented by Gail Cowan Management.
Stand-up shows
The Best $18 You'll Ever Spend (2009)
Rhyspect (2010)
Rhys Mathewson Is Fun (2011)
Rhys Mathewson Versus The World (2012)
Hombre Lobo (2014)
Nouveau Rhys (2016)
Rhys Classic (2017)
The Future Quiz (2017)
The Clumsy Tango (2018)
Heartless Joke Machine (2021)
The Mathewson & Matthewson Comedy Night (2022; with Eli Matthewson)
Heating Up (2023)
10th Rodeo (2024)
Surblibor (2024)
Time Trial (2025)
Big Mistake (2026)
Personal life
Mathewson lived in the United Kingdom in 2014. He is vegetarian.
After years of dating, Mathewson married Chelsea McEwan-Millar — actor, writer, and managing director of skincare company Go Native New Zealand — in 2022 outside of Tauranga. They live in the Grey Lynn–Ponsonby area of Auckland with their dog, Gus.