Alan M Klein is a partner of Simpson Thacher and Bartlett LLP and a member of the firm's corporate department with extensive experience in mergers and acquisitions, shareholder activism and corporate governance matters. He represented Microsoft on its US$7.2 billion acquisition of Nokia's phone business, its US$8.5 billion acquisition of Skype and its investment in Barnes & Noble's Nook business. Other clients have included Tyco International, Best Buy, Chinalco, Gas Natural SA, Portugal Telecom, Gerdau Ameristeel, Bavaria SA and Owens-Illinois. In 2012, The American Lawyer named him a 'Dealmaker of the Year'. He is a frequent commentator on M&A issues. Klein serves as Simpson Thacher's co-administrative partner and is a member of the firm's executive committee.