John has expertise in complex business transactions, including mergers and acquisitions, financings, private equity and venture capital investments, cross-border transactions, general contracts, and securities. He represents a diverse client base ranging from individual entrepreneurs and professional athletes to private equity firms, private foundations, and global businesses. In addition, John serves as outside general counsel to several firm clients in support of their day-to-day and strategic, long-term operations.


  • Crain’s Detroit Business “40 Under 40” (2010)

  • Honoree, Michigan Lawyers Weekly “Leaders in the Law” (2020)

All Service Areas


  • Harvard Law School


  • London Business School

    Masters in Finance

  • University of Michigan Business School

    B.B.A., High Distinction


  • State - Michigan
  • State - Illinois

Notable Matters

  • Represented Green Charge Networks, LLC (n/k/a ENGIE Storage), an industry-leading battery storage company based in California, in its equity sale to ENGIE, a global power, natural gas, and energy services company based in France.
  • Represented Metro Sanitation, LLC in connection with its sale of assets and real estate to Toronto-based GFL Environmental Inc.
  • Represented Dürr Ecoclean, Inc., a subsidiary of Dürr AG, a global mechanical and plant engineering firm based in Germany, in the sale of its Filtration Systems and Products Group to strategic buyer.
  • Represented Netarx in its sale to Logicalis Group, an international provider of IT and communications technologies based in Berkshire, England.
  • Represented the Detroit Zoological Society in its acquisition of the management rights to the Detroit Zoological Park from the City of Detroit.

Speeches and Publications

  • “A Sidebar with John Decker,” Michigan Lawyers Weekly, May 1, 2020.

Professional Affiliations

  • State Bar of Michigan

    Member, Business Law Section

  • American Bar Association

    Member, Business Law Section

Community Involvement

  • The Detroit Historical Society

    Chair, Board of Trustees
    Member, Executive Committee
    Chair, Governance and Nominating Committee