Wachtell Lipton was founded on a handshake in 1965 as a small group of lawyers dedicated to providing advice and expertise at the highest levels. We have achieved extraordinary results following the distinctive vision of our founders -- a cohesive team of lawyers intensely focused on solving our clients' most important problems.
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We have experience in the fields of mergers and acquisitions, strategic investments, takeovers and takeover defense, corporate and securities law and corporate governance. We handle some of the largest, most complex and demanding transactions in the United States and around the world.
Wachtell Lipton is dedicated to providing advice and expertise at the highest levels and achieving extraordinary results for our clients. We seek individuals who are talented, motivated and committed in order to maintain our record of excellence.
O'Brien, Jeannemarie
tel 212.403.1365
fax 212.403.2365

Education

Jeannemarie O’Brien is a partner in the New York law firm of Wachtell, Lipton, Rosen & Katz, where she is active in the firm’s merger and acquisition practice, focusing on the executive compensation and employee benefits aspects of transactions, with a particular emphasis on transactions involving financial services institutions.  She has been involved in over $500 billion of mergers and acquisitions transactions over the last decade.  Ms. O’Brien also advises companies and their boards on governance issues and assists companies and senior executives on executive compensation matters in both the public and private sectors, and has particular expertise regarding the compensation structures at financial institutions and the related regulatory considerations.

The transactions in which Ms. O'Brien has been involved include many major financial institution transactions, both bank and non-bank, including: City National/Royal Bank of Canada; National Penn Bancshares/BB&T; Chubb/ACE Limited; Hilltop Holdings/Plains Capital; CapitalSource/PacWest Bancorp; Umpqua Holdings Corporation/Sterling Financial Corporation; Huntington Bancshares/Camco Financial; Marshall & Ilsley/Bank of Montreal; Alleghany Corporation/Transatlantic Holdings; Comerica Incorporated/Sterling Bancshares, Inc.; Bank of America Corporation/Merrill Lynch; Wells Fargo/Wachovia; Countrywide/Bank of America Corporation; FleetBoston Financial Corp./Bank of America Corporation; MBNA/Bank of America Corporation; J.P. Morgan/Bank One; J.P. Morgan/Bank of New York; Warburg Pincus/The Mutual Fund Store and TMFS Holdings, LLC; Bank of America Corporation in its sale of Balboa Insurance Group to QBE Holdings, Inc.  She also has been involved in transactions outside of the financial sector, including: Pfizer Inc./Allergan plc; United Technologies (Sikorsky Aircraft)/Lockheed Martin; Carefusion/Becton Dickinson; Cox Automotive/Dealertrack Technologies; United Technologies Corporation/Goodrich Corporation; Thermo Fisher Scientific/Life Technologies Corporation; Vantiv/Mercury Payments Systems; Leap Wireless/AT&T; Rayonier Inc.’s spinoff of its performance fibers business; and CBS Outdoor Americas’ initial public offering.

Ms. O’Brien frequently writes and speaks on executive compensation and corporate governance issues and is recognized as a leading executive compensation lawyer in the Chambers USA Guide to America’s Leading Lawyers for Business and The Legal 500.  In addition to memos and articles on recent developments in the executive compensation area, she is an author of the chapter on executive compensation in Wachtell, Lipton, Rosen & Katz's “Financial Institutions M&A,” an annual review of leading developments.

Ms. O’Brien received a B.A. cum laude from Mount Holyoke College in 1989, and a J.D. cum laude from Fordham Law School in 1994, where she was an associate editor of the Fordham Law Review.  She is a member of the New York State and American Bar Associations. 

Ms. O’Brien serves as a member of the Board of Trustees of the Trinity School in New York City and of the non-profit organization Prep for Prep and is on the Advisory Board of St. Bartholomew Community Preschool in New York City.

Recent Publications