John P. Tamisiea - McDermott Will & Emery


John P. Tamisiea represents private and public companies, family-owned businesses and private equity funds in transactional matters. John concentrates his practice in the areas of mergers and acquisitions, strategic investments and alliances, securities offerings, venture capital investing and family office and general corporate counseling. John has also served as outside general counsel and an advisor to boards of directors for a number of clients. His clients include privately-held, publicly-traded and family-owned companies, private equity funds and investments banks.

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  • Represented Option Care Health, Inc. (NASDAQ: OPCH), the nation’s largest independent provider of home and alternate site infusion services, in its entry into a definitive merger agreement to combine with Amedisys, Inc. (NASDAQ: AMED), a leading provider of home health, hospice and high-acuity care.
  • Represented Allscripts Healthcare Solutions, Inc. (NASDAQ: MDRX) (now Veradigm) in the sale of its CarePort Health business to WellSky Corp., a global health and community care technology company, for $1.35 billion.
  • Represented Allscripts Healthcare Solutions, a global leader in Healthcare IT creating healthier lives by generating and providing insights that change the delivery of care, in its acquisition of Babel Health, Inc., a health data management company offering risk adjustment and encounter submission software tools on a single, cloud-based platform.

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  • The Legal 500 US, 2019-2022
  • IFLR1000, M&A, 2022-2023


  • Regina Dominican High School Board 2015 – 2022, Chairman of the Board 2021-2022


University of Pennsylvania Law School, JD
University of Iowa, BBA in Accounting, with highest distinction