John M. Callahan - McDermott Will & Emery


John Callahan advises clients on health sector mergers and acquisitions. Public companies, private equity firms, nonprofit health systems, academic institutions and governmental entities have trusted John to assist them in executing their most critical transactions. His unique focus on corporate and healthcare law drives an efficient and client-oriented approach to executing transactions. John is Head of International Health M&A for the Firm.

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  • BTI, M&A Client Service All-Stars, 2021
  • Chambers USA, 2012 to 2023
  • The Best Lawyers in America, Healthcare Law, Chicago, 2014 to 2024

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John recruited the health CEOs and private equity managing partners that made up Chicago mayor, Richard M. Daley’s trade delegation to Shanghai.

After graduating from the University of Notre Dame, John worked with the Missionaries of St. Charles Borromeo-Scalabrini in Mexico, serving Central American refugees and migrant workers along the US-Mexican border.


University of San Diego, JD
University of Notre Dame, BA