Mattie Tonseth

Mattie Tonseth has extensive experience in retail investment and marketing, currently serving in the Retail Capital Markets - Marketing department at Newmark since August 2025. Prior to this role, Mattie worked as the Marketing Coordinator for the Simon | Anderson Team at Kidder Mathews from December 2023 to September 2025. Earlier, from February 2017 to February 2019, Mattie was a Retail Investment Coordinator for the Sleeth Retail Investment Team at Newmark and held a similar position at Colliers from May 2010 to February 2017. Mattie holds a Bachelor of Business Administration in Marketing from the University of Washington, as well as two degrees in Interior Design from UCLA Extension and Bellevue College.