Magnusson started his career as a rider in the United States for the Uncle Wiggley Designs team in 1983. In 1987, Magnusson and his friend/partner Mike Ternasky would form the
H-Street skateboarding company, and consult with skateboarding industry leader George Abuhamad to assist with production oversight and daily operations. Magnusson and Ternasky were fond of the professional
Powell Peralta-style films, but lacked the required budget for similar professional productions and wanted to showcase innovative skater progression at a faster rate. Ternasky and Magnusson soon forged a new path to DIY home-edit videos and sign some of the era's most innovative skaters to the team. Names like
Ron Allen, Matt Hensley, and a fourteen-year-old
Danny Way. His company would shoot some of the most popular skateboarding videos in the late 1980's and early 1990's. 1988's
Shackle Me Not was considered to be a turning point as to how skateboarding videos were made, and the 1989 release of
Hokus Pokus featured new team members
Sal Barbier,
Brian Lotti, Colby Carter, Alphonzo Rawls and Jason Rogers. T-Mag and Ternasky went on to edit and/or release six additional films under the H-Street umbrella,
Not The New H-Street Video (1991),
Summer Tour (1991), ''Life: A Soldier's Story
(1991), Planet Earth: Now 'N' Later
(1991), Next Generation
(1992) and Lick'' (1993). Magnusson was also an innovator on board design. He would design a concept called the "Hell Concave", which is a deep concave that extended from the nose of the board to the tail. H-Street Skateboards later disbanded in 1993, and co-founder Mike Ternasky died in a car accident on May 17, 1994. After years of discussion, Magnusson, wife/partner Monica Magnussson and George Abuhamad resurrected the H-Street brand in 2013.
Other ventures Magnusson was also one of several people who founded
Osiris Shoes. Osiris was founded in 1996, and continues to produce technical footwear that is worn by several professional skateboarders. == Other achievements ==