Khosrowshahi will remain on Expedia's board of directors, said the company.
Okerstrom joined Expedia in 2006, a year after Khosrowshahi, and has been CFO since Sept. 2011. Before that, he worked as a consultant with Bain & Company in Boston and San Francisco, worked with UBS Investment Bank in London and worked as a lawyer. He has an M.B.A. from Harvard Business School and a law degree from the University of British Columbia.