Magnus has had a diverse career, from ECD of Hue & Cry, the design and animation studio he founded, to a VP Creative Director role at The Martin Agency. He earned his Bachelor of Architecture degree at the Southern California Institute of Architecture (SCI-Arc) and began using animation as a means to relay concepts in his building designs. Magnus then shifted into design and animation, as the industry was beginning to coalesce in his native Los Angeles.
During his tenure at The Martin Agency, he was pivotal in winning and managing the global Oreo account, beginning with the Wonderfilled campaign – a natural creative bi-product of his design background. The need for consistent design-focused content led Hierta to start Hue & Cry in 2014 as an animation division of The Martin Agency, working on Geico and UPS, in addition to Oreo. In 2018 he spun-off Hue & Cry as an independently owned and operated studio, seeing the need for a top-tier design company that would use an amplified understanding of agency-side thinking to make better work for clients. Their efforts garnered international awards, including Cannes Lions, AICP, Effie, One Show, and D&AD.