Clare O’Brien regularly advises major US and international clients on their public and private mergers and acquisition transactions, including public company restructurings, joint ventures and large public transactions.  She also provides counsel on corporate law questions, including corporate governance matters.

Ms. O’Brien has been consistently acknowledged as a leading M&A lawyer and has received numerous accolades including “Dealmaker of the Year”  by The American Lawyer, Top U.S.A. Women Dealmaker by the Global M&A Network 2021 as well as being named one of The Deal’s Top Women in Dealmaking 2021, 2022 and 2023 Lists for her work in Mergers & Acquisitions.

Prior to joining Shearman & Sterling, Ms. O’Brien worked with the law firm of Brady & Tarpey, P.C., where her practice included cross-border corporate transactions, litigation and domestic relations.  She began her legal career at the Irish law firm of Eugene F. Collins & Son.