 In 1995, he founded Zentropy Partners, which grew to become the fifth-largest interactive advertising agency in the United States.Magnussen started Hollywood-based Ripe Digital Entertainment in 2003 and closed it in 2009, after selling Zentropy to Interpublic Group for $50 million in 1999, according to the Wall Street Journal.His latest endeavor, The Grail Project was an effort to develop a "new approach for digital content delivery."