John P. Tamisiea - McDermott Will & Emery


John P. Tamisiea represents business enterprises of all sizes in transactional and securities law matters. John concentrates his practice in the areas of mergers and acquisitions, securities law compliance, strategic alliances, venture capital investing and general corporate counseling. John represents private and public companies of all sizes, while also serving as outside general counsel and as an advisor to boards of directors. His clients include publicly traded and privately held companies, investment banks and private equity firms. John is known for his client-centered approach and natural problem-solving ability.

Show More


  • Represented Actuant Corporation (NYSE: ATU) in connection with the:
    • Acquisition of Hayes Industries, a leader in concrete pre- and post-tensioning products
    • Sale of Actuant’s RV business
    • Sale of Actuant’s Electrical segment to private equity firm Sentinel Capital Partners

Show More


  • The Legal 500 US 2019 and 2022
  • Leading Lawyers Network


  • American Bar Association
  • St. Francis Xavier Parish, member of Finance Committee, former president of school board


University of Pennsylvania Law School, JD, 1990
University of Iowa, BBA, with highest distinction, 1987