Magnus Walker (born July 7, 1967) is a British former fashion designer and car collector. He emigrated to the United States in 1986 at the age of nineteen and eventually established a clothing brand, called Serious, with his late wife, Karen Caid Walker. Having been fascinated with Porsche since childhood, Walker started collecting and customizing vintage Porsches, mostly the air-cooled 911 model. After the documentary Urban Outlaw about his life, Walker became one of the world's most visible faces of the Porsche and car collecting scene. He has since been featured in a multitude of media, such as The Joe Rogan Experience (2015), and Jay Leno's Garage (2017), and the 2015 video game Need for Speed.