[1] Halvorsen attended Williams College, where he was a member of the ski team, and graduated in 1986 with a degree in economics.
[1] [9] At Stanford, he received the Alexander A. Robichek Student Achievement Award in Finance and was an Arjay Miller Scholar.
He sat on Tiger's advisory board, and on the supervisory board of the firm's largest fund, Jaguar Fund N.V..[12] In 1999, Halvorsen left Tiger to co-found Viking Global Investors, an investment firm managing capital in excess of $30 billion, of which he is currently the CEO, alongside David Ott and Brian Olson.
[15] Viking Global's main operations cover public equity and hedge funds on the international market.
[11] Previously, Halvorsen has been a trustee of Greenwich Academy, a board member of Right To Play USA, and sat on the advisory council of the Stanford Graduate School of Business.