Marcus Rosner was born on the west coast of British Columbia but grew up just outside Edmonton in the suburban prairie town of Sherwood Park, Alberta. A lifelong athlete with no background in drama, he never considered a career in entertainment until a formative trip to New York City with his mother introduced him to Broadway and sparked his passion for storytelling. Soon after, he relocated to Vancouver, attended Vancouver Film School, and began building a career in film and television.

Over the past decade, Rosner has appeared in acclaimed series such as CONTINUUM (SYFY), ARROW and SUPERNATURAL (The CW), MISTRESSES and ONCE UPON A TIME (ABC), GIRLFRIENDS’ GUIDE TO DIVORCE (Bravo), WHEN CALLS THE HEART (Hallmark), and Lifetime’s UNREAL. In 2022, he starred as Nico in Buzzfeed Studios/Lionsgate’s MY FAKE BOYFRIEND alongside Keiynan Lonsdale, Sarah Hyland, and Dylan Sprouse. He is also a mainstay leading man on Hallmark Channel, most recently seen in NOTES OF AUTUMN and ROMANCE TO THE RESCUE and joined the main cast of SULLIVAN’S CROSSING (CTV/The CW) at the end of the series’ third season.

Beyond acting, Rosner is a producer with Edmonton-based Northern Gateway Films, where he collaborates on a slate of movies-of-the-week and indie features. In 2025, he expanded his creative journey as writer and director with his debut short film, Emergency, a deeply personal project inspired by his childhood.