Mr Alan Klein > Simpson Thacher & Bartlett LLP > New York, United States > Lawyer Profile

Simpson Thacher & Bartlett LLP
NEW YORK, NY 10017-3954
United States
Alan Klein photo

Work Department

Corporate/Mergers and Acquisitions


Alan is a Partner in the Firm’s M&A Practice and until recently served as Co-Head of the Practice. Advised Microsoft on many transactions, including its acquisitions of LinkedIn, Skype, Nuance, Zenimax, GitHub and Nokia’s phone business and its announced acquisition of Activision; ChemChina in its acquisition of Syngenta, the largest acquisition ever by a Chinese company; Tyco in its merger with Johnson Controls, Inc.; and numerous other companies in cutting-edge transactions including ADT, Best Buy, Wendy’s and Royal Ahold. He has also advised the boards of public companies including Twitter with respect to Elon Musk’s announced acquisition of Twitter, Aetna, Xerox, Yahoo and Baker Hughes, among others, on corporate governance matters.


Joined, 1984; Partner, 1993.


Haverford College (B.A., with Honors, 1981); Harvard Law School (J.D., cum laude,1984).

Lawyer Rankings

United States > M&A/corporate and commercial > M&A: large deals ($1bn+)

(Leading lawyers)

Alan KleinSimpson Thacher & Bartlett LLP

Simpson Thacher & Bartlett LLP‘s team of ‘first-rate M&A practitioners‘ has a long-established reputation for expertise across a broad variety of corporate transactions including joint ventures, negotiated and unsolicited mergers and takeovers, minority investments and buyouts. Kathryn King Sudol is also an expert in respect of LBOs, going-private transactions, securities law and strategic investments, serving as practice co-head alongside Eric Swedenburg, who complements his transactional prowess with shareholder activism, corporate governance and general corporate knowhow. Lee Meyerson fronts the firm’s financial institutions practice, handling a plethora of sector-specific deals, while Alan Klein is significantly well-versed in fintech, technology and healthcare-related transactions. Mario Ponce is another integral name to the practice, leveraging three decades worth of experience. Referenced lawyers are based in New York.