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John J. Zak

Co-Chair of the Firm, Partner

John is the Co-Chair and a Partner of the firm, Securities Regulation & Corporate Compliance Practice Leader, Investment Management & Compliance Practice Leader, and Mergers & Acquisitions Practice Co-Leader.  He concentrates his practice in U.S. securities regulation and compliance, mergers and acquisitions, and corporate law and governance. He is active in the firm's U.S.-Canada Practice and regularly counsels Canadians and other international clients on U.S. securities, investment management, and corporate law matters. He has extensive experience in public and private securities offerings, venture capital and private equity transactions and executive compensation arrangements. He also has extensive experience in shareholder disputes and related litigation, including appraisal and NYBCL 1104 and 1104-a dissolution proceedings.

John is a co-author of the Practical Law Company module on New York business corporation law.

John exclusively practices U.S. law and is admitted to practice in New York.

Representative Work

For client Integer Holdings Corporation (NYSE : ITGR), a medical device outsourcing (MDO) manufacturer:

  • Acquisition of Lake Region Medical from affiliates of KKR/Bain.
  • Disposition of the Advanced Surgical & Orthopedics business to Viant Group.
  • Tax-free spin-off of Nuvectra Corporation (Nasdaq : NVTR), a neuromodulation device developer.
  • Acquisition of US Bio Design LLC.
  • Acquisition of Aran Biomedical (Ireland).
  • Acquisition of Pulse Technologies, Inc.
  • Acquisition of InNeuroco, Inc.

For client Summer Street Capital Partners, a private equity sponsor:

  • Acquisition and subsequent disposition of portfolio company Multisorb Technologies Inc., a world leader in active packaging solutions for the pharma, food and electronics markets.
  • Acquisition and subsequent disposition of portfolio company Ira Green Holdings, Inc., the leading manufacturer and distributor of U.S. military decorations, insignia and uniform accessories.
  • Acquisition and subsequent disposition of portfolio company Willcare, a NY-based home care provider.

For client Rand Capital Corporation (Nasdaq : RAND), an SEC-registered business development company (BDC):

  • Stock sale and externalization of investment management to affiliates of East Asset Management.


  • Listed, Best Lawyers in America (Corporate Law) 2009 - 2024
  • Listed, Chambers USA: America’s Leading Lawyers for Business, (Corporate and Mergers & Acquisitions) 2019 - 2024

News & Insights


  • Shea's O'Connell Preservation Guild Ltd. Board of Trustees (Shea's Performing Arts Center) (2007-2020), Past Chair (2017-2019)
  • Buffalo Philharmonic Orchestra Foundation, Inc. Board of Directors (2014-2024), Past Chair (2019-2024)
  • Buffalo Philharmonic Orchestra Society, Inc. Board of Trustees (Buffalo Philharmonic Orchestra), Treasurer; member, Executive Committee


  • New York State Bar Association Business Law Section Securities Law Subcommittee
  • American Bar Association Section on Corporation, Banking, and Business Law
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John J. Zak / News & Insights