NEW YORK--(BUSINESS WIRE)--Halper Sadeh LLC, an investor rights law firm, is investigating whether the sale of Heidrick & Struggles International, Inc. (NASDAQ: HSII) to a consortium of investors led by Advent International and Corvex Private Equity for $59.00 per share in cash is fair to Heidrick shareholders. Halper Sadeh encourages Heidrick shareholders to click here to learn more about their legal rights and options or contact Daniel Sadeh or Zachary Halper at (212) 763-0060 or sadeh@ha. ...