JONATHAN J. MAZELSKY - Corporate Board Profile

DENTSPLY SIRONA Inc.

Filing Date	Source Excerpt
2023-04-14	Mr. Mazelsky has served as President and CEO of IDEXX Laboratories, Inc. since October 2019. Prior to that, Mr. Mazelsky served as Interim President and CEO of IDEXX from June 2019 to October 2019, and he was an Executive Vice President responsible for IDEXX’s 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, from August 2012 to June 2019. Before joining IDEXX, Mr. Mazelsky was a Senior Vice President and General Manager from 2010 to 2012 of Computed Tomography, Nuclear Medicine and Radiation Therapy Planning at Philips Healthcare, a subsidiary of Royal Philips Electronics (now named Royal Philips). Previously he held a series of other leadership roles with increasing responsibilities during his tenure at Philips beginning in 2001. Prior to joining Philips, Mr. Mazelsky was at Agilent Technologies, where he was an Executive in Charge from 2000 to 2002, leading the integration of Agilent’s Healthcare Group into Philips. He also served as a General Manager of the Medical Consumables Business Unit at Agilent Technologies from 1997 to 2000. From 1988 to 1996, Mr. Mazelsky held a number of roles at Hewlett Packard in finance, marketing and business planning. Mr. Mazelsky holds an undergraduate degree in Mathematics from the University of Rochester and an MBA from the University of Chicago.
2024-04-10	Jonathan J. Mazelsky Independent Age: 63 Board Committees: • Human Resources Committee • Science and Technology Committee Other Public Company Boards: • IDEXX Laboratories, Inc. Mr. Mazelsky has served as President and CEO of IDEXX Laboratories, Inc. since October 2019. Prior to that, Mr. Mazelsky served as Interim President and CEO of IDEXX from June 2019 to October 2019, and he was an Executive Vice President responsible for IDEXX’s 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, and the Rapid Assay and Telemedicine lines of business, from August 2012 to June 2019. Before joining IDEXX, Mr. Mazelsky was a Senior Vice President and General Manager from 2010 to 2012 of Computed Tomography, Nuclear Medicine and Radiation Therapy Planning at Philips Healthcare, a subsidiary of Royal Philips Electronics (now named Royal Philips). Previously he held a series of other leadership roles with increasing responsibilities during his tenure at Philips beginning in 2001. Prior to joining Philips, Mr. Mazelsky was at Agilent Technologies, where he was an Executive in Charge from 2000 to 2002, leading the integration of Agilent’s Healthcare Group into Philips. He also served as a General Manager of the Medical Consumables Business Unit at Agilent Technologies from 1997 to 2000. From 1988 to 1996, Mr. Mazelsky held a number of roles at Hewlett Packard in finance, marketing and business planning. Mr. Mazelsky holds an undergraduate degree in Mathematics from the University of Rochester and an MBA from the University of Chicago.

Filing Date

Source Excerpt

2023-04-14

Mr. Mazelsky has served as President and CEO of IDEXX Laboratories, Inc. since October 2019. Prior to that, Mr. Mazelsky served as Interim President and CEO of IDEXX from June 2019 to October 2019, and he was an Executive Vice President responsible for IDEXX’s 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, from August 2012 to June 2019. Before joining IDEXX, Mr. Mazelsky was a Senior Vice President and General Manager from 2010 to 2012 of Computed Tomography, Nuclear Medicine and Radiation Therapy Planning at Philips Healthcare, a subsidiary of Royal Philips Electronics (now named Royal Philips). Previously he held a series of other leadership roles with increasing responsibilities during his tenure at Philips beginning in 2001. Prior to joining Philips, Mr. Mazelsky was at Agilent Technologies, where he was an Executive in Charge from 2000 to 2002, leading the integration of Agilent’s Healthcare Group into Philips. He also served as a General Manager of the Medical Consumables Business Unit at Agilent Technologies from 1997 to 2000. From 1988 to 1996, Mr. Mazelsky held a number of roles at Hewlett Packard in finance, marketing and business planning. Mr. Mazelsky holds an undergraduate degree in Mathematics from the University of Rochester and an MBA from the University of Chicago.

2024-04-10

Jonathan J. Mazelsky Independent Age: 63 Board Committees: • Human Resources Committee • Science and Technology Committee Other Public Company Boards: • IDEXX Laboratories, Inc. Mr. Mazelsky has served as President and CEO of IDEXX Laboratories, Inc. since October 2019. Prior to that, Mr. Mazelsky served as Interim President and CEO of IDEXX from June 2019 to October 2019, and he was an Executive Vice President responsible for IDEXX’s 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, and the Rapid Assay and Telemedicine lines of business, from August 2012 to June 2019. Before joining IDEXX, Mr. Mazelsky was a Senior Vice President and General Manager from 2010 to 2012 of Computed Tomography, Nuclear Medicine and Radiation Therapy Planning at Philips Healthcare, a subsidiary of Royal Philips Electronics (now named Royal Philips). Previously he held a series of other leadership roles with increasing responsibilities during his tenure at Philips beginning in 2001. Prior to joining Philips, Mr. Mazelsky was at Agilent Technologies, where he was an Executive in Charge from 2000 to 2002, leading the integration of Agilent’s Healthcare Group into Philips. He also served as a General Manager of the Medical Consumables Business Unit at Agilent Technologies from 1997 to 2000. From 1988 to 1996, Mr. Mazelsky held a number of roles at Hewlett Packard in finance, marketing and business planning. Mr. Mazelsky holds an undergraduate degree in Mathematics from the University of Rochester and an MBA from the University of Chicago.

Filing Date	Source Excerpt
2022-03-31	Mr. Mazelsky has served as President and CEO of IDEXX since October 2019...Director and President and Chief Executive Officer...Age: 61...Committees: None...Mr. Mazelsky, who is an employee, receives no additional compensation for his Board service.
2023-03-31	Mr. Mazelsky has served as President and CEO of IDEXX since October 2019. ... Director and President and Chief Executive Officer Age: 62 Director since: October 2019 Committees: None ... Mr. Mazelsky, who is an employee, receives no additional compensation for his Board service.
2024-03-27	Jonathan J. Mazelsky, President and Chief Executive Officer, IDEXX Laboratories, Inc., Director, Age: 63, Director since: October 2019, Committees: None, Mr. Mazelsky, who is an employee, receives no additional compensation for his Board service.
2025-03-28	Jonathan J. Mazelsky, 64, President and Chief Executive Officer, IDEXX Laboratories, Inc., Director, Director since October 2019, Committees: None, 2024 Non-Employee Director Compensation Table notes he receives no additional compensation for Board service.

Data sourced from SEC filings. Last updated: 2025-12-06

DENTSPLY SIRONA Inc.

IDEXX LABORATORIES INC /DE