Byron S. Kalogerou is the founder of the Firm’s Life Science Industry Group and the senior partner in the Boston Corporate Practice. He helps clients execute on their growth strategies by guiding them through complex domestic and cross-border mergers and acquisitions and joint ventures and alliances. He also assists early stage life science companies in their capital raising efforts. Byron has extensive industry background in the life science, industrial and manufacturing sectors. He also acts as outside general counsel to a number of companies.

Byron spent 17 years in-house, where he served in various general counsel roles at Tyco International, including as general counsel of its fire and security and telecom businesses and as general counsel of its international legal department, a function he created. Byron led many of Tyco’s largest acquisitions, including the $12 billion acquisition of AMP Inc. and the $850 million purchase of AT&T Submarine Systems, and handled hundreds of middle-market deals around the globe. Byron also handled Tyco’s initial foray into medical devices and led many of the deals that formed Covidien, now part of Medtronic.

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  • Advised Medline, Inc., a family-owned maker and distributor of medical devices and equipment, on the healthcare regulatory elements of the $30 billion leveraged buyout by a consortium of private equity firms, including Blackstone Group, Carlyle Group and Heller & Friedman.
  • Representing Biogen in various licensing and collaboration transactions.
  • Representing Johnson and Johnson’s Global External Innovation on various early stage financing matters.

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  • The Legal 500 United States 2012 to 2018
  • Acritas Stars 2019 – 2020, listed among independently rated lawyers
  • LMG Life Sciences, Life Science Star 2016, 2018, 2019, 2020


  • American Bar Association, Committee on Mergers and Acquisitions, Co-Chair, Task Force on Legal Project Management


Vermont Law School, JD, 1986
Harvard Business School, Advanced Management Program Certificate, 2001
Dartmouth College, BA, 1983
Phillips Exeter Academy, 1979


Byron S. Kalogerou

Insights & Events / Media

Virtual Event / Speaking Engagements / December 1-3, 2021

Virtual Event / McDermott Event / October 20 - November 17, 2020

Special Report / December 9, 2019

Shanghai, China / McDermott Event / November 12, 2019

Medical Product Outsourcing / September 6, 2019

Innovations in Legal Project Management / October 2018

Legal News / July 2, 2018

Boston, Massachusetts / McDermott Event / June 6, 2018

Boston, Massachusetts / Speaking Engagements / June 4-7, 2018

Denver, Colorado / Speaking Engagements / April 23, 2018

Orlando, Florida / Speaking Engagements / April 13, 2018

Deal Points (ABA Mergers & Acquisitions Committee) / Fall 2017

Cambridge, Massachusetts / McDermott Event / October 4, 2017

International News / April 2017

San Francisco, California / McDermott Event / January 10, 2017

Acquisition International (UK) / August 4, 2016