Jonathan J. Mazelsky

President and Chief Executive Officer, IDEXX Laboratories, Inc.


Age: 63

Director since:
October 2019


Other current public company director service:

  • Dentsply Sirona Inc. (since May 2023)



  • President and CEO (since October 2019)
  • Interim President and CEO (June 2019 – October 2019)
  • Executive Vice President (August 2012 – June 2019)

Philips Healthcare, a subsidiary of Royal Philips Electronics (now named Royal Philips)

  • Senior Vice President and General Manager, Computed Tomography, Nuclear Medicine and Radiation Therapy Planning (2010 – 2012)
  • Various roles of increasing responsibility (2001 – 2010)

Agilent Technologies (acquired by Royal Philips Electronics in 2001)

  • Executive in Charge (2000 – 2002)
  • General Manager, Medical Consumables Business Unit (1997 – 2000)

Hewlett Packard

  • Various roles in finance, marketing and business planning (1988 – 1996)


  • Executive Leadership: Extensive leadership and management experience gained during his time in various roles at IDEXX, including as President and CEO during which time he has prioritized innovation and built expanded commercial capabilities, and as Executive Vice President in which role he was responsible for the North American Companion Animal Group Commercial Organization and key elements of the innovation portfolio, including IDEXX VetLab in-house diagnostics, Diagnostic Imaging, Veterinary Software and Services, Rapid Assay and Telemedicine lines of business.
  • Corporate Strategy: Deep experience developing and implementing strategies for continued long-term sustainable growth at IDEXX, including transforming our go-to-market strategy in North America in 2014, significant international commercial expansions, investments in innovation and an emphasis on delivering a differentiated customer experience.
  • Operations: Substantial experience developed while overseeing the operations of global enterprises at IDEXX, including maintaining product availability and on-time delivery levels amidst supply chain challenges, acquiring and integrating our ezyVet software product line and scaling our warehouse, distribution and manufacturing capabilities to support continued growth.
  • Mr. Mazelsky also brings significant corporate governance, financial acumen, science, technology and R&D, human capital management, international business, digital, corporate finance, sustainability and risk oversight skills and experience to the Board.


  • BA, Mathematics, University of Rochester
  • MBA, University of Chicago