She received a PhD in music from Otago in 2010 on the subject of the iconography of Louis Jullien, Hans Richter and Sir Henry Wood.
[4] For 2014-2015, she was a Leverhulme Fellow in conducting at the Royal Conservatoire of Scotland (RCS), mentored by Garry Walker, and assistant to Donald Runnicles at the BBC Scottish Symphony Orchestra.
With the Royal Liverpool Philharmonic Orchestra and Isata Kanneh-Mason, Mathieson has recorded music of Clara Schumann commercially for Decca Classics.
[7] In 2018, Mathieson first guest-conducted Symphony Nova Scotia, as one of two finalist candidates for the post of music director with the orchestra.
In December 2019, Symphony Nova Scotia announced the appointment of Mathieson as its next music director, effective January 2020, with an initial contract of 3 years.