Stephen Taub A Former Hedge Fund Manager Is Going on a SPAC Fundraising Spree Ex-Senator co-founder Alexander Klabin and his SPAC co-chairman Spencer Rascoff have filed plans to raise money for two blank-check companies in the last week. Stephen Taub February 18, 2021 Spencer Rascoff, former CEO of Zillow Group. (Patrick T. Fallon/Bloomberg)