Company: CLH
Filing Date: 2025-04-11
Form Type: DEF 14A
Source: 0000822818-25-000011
Chunk: 23

Company: CLEAN HARBORS INC
Filing Date: 2025-04-11
Form: DEF 14A
Chunk 23
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).

George L. Curtis has served as Executive Vice President, Pricing & Proposals since 2009. He joined the Company in 1980, and has served in a variety of management positions, the most recent of which were Senior Vice President of Pricing and Proposals and Vice President of Marketing. Mr. Curtis holds a BA in Biology from Columbia University and an MBA from Northeastern University.

Jeroen Diderich joined the Company in 2024, following an extensive career in a variety of executive management, sales and operations roles. Prior to joining Clean Harbors, he spent 20 years at Avery Dennison, most recently serving as Senior Vice President of North America Materials Group, Global Reflective Solutions and Global Procurement. For more than a decade he held various senior management roles at Avery Dennison in marketing, sales and service, and supply chain while stationed in The Netherlands. Before his work at Avery, Jeroen spent 11 years in the paper industry at SAPPI working on supply chain and strategy positions in multiple countries. Jeroen holds a master’s degree in economics and business

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economics from Erasmus University Rotterdam, The Netherlands as well as several subsequent certifications including the Advanced Management Program at the Wharton School at the University of Pennsylvania and Lean Six Sigma training.

Sharon M. Gabriel is Executive Vice President and Chief Information Officer. She was appointed to that position in October 2018. She joined Clean Harbors in 2001 and has held a variety of positions of increasing responsibility with the most recent prior position being Senior Vice President of Management Information Systems. Ms. Gabriel is leading the Company’s push toward innovative technologies related to artificial intelligence, robotic process automation, and many mobility applications and manages the Company’s cybersecurity and cyber incident preparedness and response. She holds a BS in Environmental Science from New England College.

Robert Harrison is Executive Vice President, Health & Safety. He joined the Company in November 2022. Prior to joining the Company, Mr. Harrison was most recently the Health, Safety and Environmental (HSD) and Quality Vice President for Air Liquide American Corporation from 2016 to 2022, where he supported more than 800 locations and six business units that included responsibility for 2,000 miles of pipeline. Previously, Mr. Harrison held the positions of HSE director for Halliburton and for Rolls Royce. Prior to that, he held health and safety managerial roles at Honeywell and 3M. Mr. Harrison