During his time as an undergraduate at USC, he developed an award-winning business plan for a class project that would eventually grow to become Zentropy Partners, according to the Los Angeles Business Journal.
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In 1995, he founded Zentropy Partners, which grew to become the fifth-largest interactive advertising agency in the United States.
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Magnussen formed Zentropy Partners, an interactive advertising and branding company, in 1995 just prior to the dot-com boom.
Silver Lake Partners | Foster and Partners | Providence Equity Partners | Greycroft Partners | Thomas H. Lee Partners | Norwest Venture Partners | Zentropy Partners | Pei Cobb Freed & Partners | Oak Hill Capital Partners | KPS Capital Partners | Highland Capital Partners | Greylock Partners | Foster + Partners | Value Partners | Sun Capital Partners | Partners In Health | Partners HealthCare | Partners for Democratic Change International | Oak Investment Partners | Institutional Venture Partners | Insight Venture Partners | Hedley Byrne & Co Ltd v Heller & Partners Ltd | Goodby, Silverstein & Partners | Enterprise Community Partners | Elevation Partners | Charlesbank Capital Partners | Accel Partners | Wind Point Partners | Summit Partners | Partners in Health |
Boathouse was founded in 2001 by founding partners John Connors, III (former head of Zentropy Partners and son of Jack Connors, founder of Hill Holliday) and Christopher Boland.