Hal J. Leibowitz


Hal J. Leibowitz


  • Co-Chair, Mergers and Acquisitions Practice

Hal Leibowitz is co-chair of WilmerHale's Mergers and Acquisitions Practice Group. He has previously served as chair of the firm's Corporate Practice and as vice chair of the Transactional Department. Mr. Leibowitz's practice focuses on corporate and securities law matters for companies in the technology, life sciences and services industries, with an emphasis on mergers and acquisitions and public company counseling.

Among the clients he represents are:

  • Akamai Technologies
  • Analogic Corporation
  • Cynosure, Inc.
  • Hasbro, Inc.
  • Kadant Inc.
  • PAREXEL International
  • PerkinElmer, Inc.
  • Progress Software Corporation
  • PTC Therapeutics, Inc.
  • RSA Security Inc.
  • The Boston Consulting Group
  • Thermo Fisher Scientific
  • Xcerra Corporation

Mr. Leibowitz has served as counsel in a wide range of merger and acquisition transactions, including acquisitions and dispositions of numerous public and private companies, tender offers, exchange offers, and going private transactions

Professional Activities

Mr. Leibowitz is a member of the American, Massachusetts and Boston Bar Associations and a member of the American Bar Association's Section on Business Law, where he has served as chair of the Merger and Acquisitions Committee's Market Trends Subcommittee and on the Editorial Board of the Committee's Subcommittee on Public Company Acquisitions. In addition, he has chaired the ABA Market Trends Subcommittee's annual survey of deal points in the acquisition of public companies. Mr. Leibowitz is also a member of the Thomson Reuters Governance, Risk and Compliance Partner Advisory Board, a think tank that discusses pressing issues facing the legal industry and formulates solutions to help colleagues run more effective businesses.


    • Representation of MKS Instruments in its proposed $6 billion acquisition of Coherent and in its acquisition of Newport Corporation
    • Representation of Thermo Fisher Scientific in its acquisitions of Finesse Solutions, Alfa Aesar, Advanced Scientifics, One Lambda, Phadia Group, Fementas International, Cohesive Technologies, Priority Solutions, the Kendro Laboratory Products division of SPX Corporation, Gatan and the cell sorting technology assets of Propel Labs; and in divestitures of its Anatomical Pathology, Cell Culture, Cole-Palmer, Gene Modulation, Magnetic Particles, Athena and Lancaster Laboratories businesses
    • Representation of PerkinElmer in its pending acquisition of Oxford Immunotec and its acquisitions of Caliper Life Sciences, Signature Genomic Laboratories and ViaCell, in the divestiture of its illumination and detection solutions and aerospace businesses and in the divestiture of its medical imaging business to Varian Medical Systems
    • Representation of General Catalyst, the largest shareholder of Livongo, in the $18.5 billion merger of Livongo and Teladoc Health
    • Representation of Tetraphase Pharmaceuticals in its merger with La Jolla Pharmaceutical Company and its previous agreements to be acquired by each of AcelRx Pharmaceuticals and Melinta Therapeutics
    • Representation of Progress Software in its acquisitions of Ipswitch, IONA Technologies, Rollbase and Telerik and in the divestiture of its Apama, Orbix, Artix, Orbacus, Sonic, Savvion, Actional, DataXtend and Shadow product lines
    • Representation of Akamai in its acquisitions of Exceeda, Janrain, Soha Systems, Bloxx, Octoshape, Prolexic, Cotendo, Speedera Network, Nine Systems and Netli, and in the divestiture of its Advertising Decision Solutions business
    • Representation of Kadant in its acquisitions of The Johnson Corporation and Syntron Medical Handling Group
    • Representation of Houghton Mifflin Harcourt in the divestitures of its Riverside clinical and standardized testing, Curious World and Adult Education businesses and in its acquisition of the Waggle adaptive learning solution business
    • Representation of Lydall in its acquisition of Interface Performance Materials
    • Representation of Corvia Medical in its strategic investment by Edwards Lifesciences
    • Representation of PTC Therapeutics in its acquisitions of certain assets of Marathon Pharmaceuticals and BioElectron Technology and its acquisition of Agilis Biotherapeutics
    • Representation of Analogic Corporation in its acquisition by an affiliate of Altaris Capital Partners
    • Representation of Cynosure in its acquisition by Hologic
    • Representation of Tokai Pharmaceuticals in its acquisition of Otic Pharma
    • Representation of a global institutional investor in the proposed merger of equals transaction between DraftKings and FanDuel
    • Representation of PAREXEL International in its acquisitions of Execupharm, Health Advances and Heron Group Limited
    • Representation of The First Marblehead Corporation in its acquisition by FP Resources USA Inc.
    • Representation of ASICS in its acquisitions of FitnessKeeper and Fast North
    • Representation of Analogic in its acquisitions of Ultrasonix Medical and Oncura Partners
    • Representation of Palomar Medical Technologies in its acquisition by Cynosure
    • Representation of a global manufacturing company in its divestiture of Charter Medical
    • Representation of Enobia Pharma in its acquisition by Alexion Pharmaceuticals
    • Representation of Netezza in its acquisition by IBM
    • Representation of Icagen in its acquisition by Pfizer
    • Representation of LTX Corporation in its combination with Credence Systems, its proposed combination with Verigy Ltd. and its acquisition of the Multitest and Everett Charles Technologies businesses of Dover Corporation
    • Representation of Skillsoft PLC in its acquisition by a new company formed by funds sponsored by each of Berkshire Partners, Advent International and Bain Capital
    • Representation of Aspect Medical in its acquisition by Covidien
    • Representation of Sepracor in its acquisition by Dainippon Sumitomo Pharma
    • Representation of The Medicines Company in its acquisition of Targanta Therapeutics
    • Representation of Millennium Pharmaceuticals in its acquisition by Takeda Pharmaceuticals
    • Representation of Applix in its acquisition by Cognos
    • Representation of Keane in its acquisition by Caritor and in its acquisitions of Metro Information Systems and Signal Tree Solutions
    • Representation of RSA Security in its acquisition by EMC Corporation and in its acquisitions of Cyota, 3-G International, XCert International, Intrusion Detection, DynaSoft and PassMark Security
    • Representation of Eyetech Pharmaceuticals in its acquisition by OSI Pharmaceuticals
    • Representation of Oasis Semiconductor in its sale to SigmaTel, Inc.
    • Representation of Saucony in its sale to The Stride Rite Corporation
    • Representation of Bookham Technology in its acquisition of New Focus


  • Recognized as a Massachusetts leader in the corporate/M&A field in the 2006–2020 editions of Chambers USA: America's Leading Lawyers for Business
  • Selected by his peers in the 2012–2021 editions of the Best Lawyers in America in the area of corporate law
  • Recommended in the 2016–2020 editions of The Legal 500 United States for M&A/Corporate and Commercial: Middle-Market and M&A/Corporate and Commercial: Corporate Governance
  • Selected by LMG Life Sciences as winner of its "Canadian Impact Deals of the Year" in 2013 award for representation of Enobia Pharma in the company's acquisition by Alexion Pharmaceuticals, Inc.
  • Listed in The International Who's Who of Lawyers as one of the world's leading lawyers in the Life Sciences: Transactional, Corporate: Mergers and Acquisitions and Corporate: Corporate Governance practice areas
  • Recognized in the 2004–2020 editions of Boston Magazine as a "New England Super Lawyer" (formerly "Massachusetts Super Lawyer") for mergers and acquisitions, as well as for his representation of public companies

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  • Education

    • JD, Suffolk University Law School, 1985

      magna cum laude Class Valedictorian; Editor, Suffolk University Law Review; Member, national championship team of the J. Braxton Craven Constitutional Law Moot Court Competition
    • BA, Brandeis University, 1982

      cum laude
  • Admissions

    • Massachusetts