Executive Management

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    Alan S. McKim

    Founder, Executive Chairman and Chief Technology Officer
    Mr. McKim, who founded Clean Harbors in 1980, became Executive Chairman and Chief Technology Officer of the Company in March 2023 as part of a planned transition. Before that, he served as Chairman of the Board of Directors and Chief Executive Officer of the Company since its inception and President from September 2016 to March 2023. Mr. McKim received an MBA from Northeastern University's D'Amore - McKim School of Business. He serves on Northeastern University's Board of Trustees and received an honorary doctorate from the Massachusetts Maritime Academy. He also serves on South Shore Health's Board of Directors. Mr. McKim is recognized as an industry leader with more than four decades in the environmental services business. ... 
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    Michael L. Battles

    Co-Chief Executive Officer
    Mr. Battles was appointed in March 2023 as the Company’s Co-Chief Executive Officer and Co-President after serving for seven years as the Company’s Executive Vice President and Chief Financial Officer. He joined Clean Harbors as Senior Vice President, Corporate Controller and Chief Accounting Officer in September 2013. Prior to Clean Harbors, Mr. Battles served in a variety of senior financial positions at PerkinElmer Inc., a global leader in human and environmental health. His roles included financial leadership of the Human Health business, Chief Accounting Officer, and acting Chief Financial Officer. Prior to PerkinElmer, Mr. Battles worked for Deloitte & Touche LLP in the firm's audit function including an assignment in the firm's National Office in accounting research. Mr. Battles is a member of the board of directors of Casella Waste Systems, Inc. (NASDAQ: CWST), a regional solid waste, recycling and resource management service company, and serves on its audit and nominating and ESG committees. Mr. Battles holds a BS in Business Administration with a concentration in Accounting from the University of Vermont and is a certified public accountant. He also has a Certificate in Cybersecurity Oversight issued by the National Association of Corporate Directors and Carnegie Mellon University. ... 
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    Eric W. Gerstenberg

    Co-Chief Executive Officer
    Mr. Gerstenberg was named Co-Chief Executive Officer and Co-President in March 2023, after serving for eight years as the Company’s Chief Operating Officer. From 2010 to 2015 Mr. Gerstenberg held positions of increasing responsibility including President of the Environmental, Industrial & Field Services business, Vice President of Disposal Services and Executive Vice President, Environmental Services. In that role, he oversaw Field Services, Technical Services, Disposal Facilities, Transportation and Sales for the Environmental Group. Mr. Gerstenberg joined Clean Harbors in 1989, serving in a variety of positions including General Manager of the Natick, Baltimore, and Chicago facilities. He stepped away from the organization briefly in 1997, serving as Vice President of Operations for privately owned Pollution Control Industries before returning to Clean Harbors in 1999. Mr. Gerstenberg received a Bachelor of Science degree in Engineering from Syracuse University. ... 
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    Eric J. Dugas

    Executive Vice President and Chief Financial Officer
    Mr. Dugas was named Executive Vice President and Chief Financial Officer in March 2023, after serving for five years as Senior Vice President, Finance and Chief Accounting Officer. He joined Clean Harbors in March 2014 as the Director of External Reporting and Technical Accounting. Prior to joining Clean Harbors, Mr. Dugas spent 13 years with Deloitte & Touche LLP where he held several positions of increasing management responsibility. He received a Bachelor of Science in Accounting from Boston College and is a Certified Public Accountant. ... 
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    George L. Curtis

    Executive Vice President, Pricing & Proposals*
    Mr. Curtis joined the Company in 1980, and he has served in a variety of management positions the most recent of which were Vice President of Marketing and Vice President of Business Development. Mr. Curtis holds an MBA degree from Northeastern University and a Bachelor of Arts degree in Biology from Columbia University. ... 
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    Jeroen Diderich

    President of Environmental Sales & Service
    Mr. 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 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. ... 
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    Sharon M. Gabriel

    Executive Vice President and Chief Information Officer*
    Ms. Gabriel was named Executive Vice President and CIO in October 2018. She joined Clean Harbors in 2001 and has held a variety of positions of increasing responsibility with the most recent being Senior Vice President of MIS. Ms. Gabriel is leading the Company’s push toward innovative technologies related to Artificial Intelligence, Robotic Process Automation (RPA) and many mobility applications. She holds a Bachelor of Science degree in Environmental Science from New England College. ... 
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    Robert Harrison

    EVP, Health & Safety*
    Mr. Harrison joined the Company as Executive Vice President of Safety and Risk Management in 2022. He was most recently the Health, Safety and Environmental (HSE) and Quality Vice President for Air Liquide where he supported more than 800 locations and six business units that included responsibility for 2,000 miles of pipeline. Previously, Robert 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. Robert holds a Master of Science and Bachelor of Arts degrees in Occupational Safety and Health from Murray State University in Murray, Kentucky. He’s also a Six Sigma Greenbelt, Certified Safety Professional (CSP), and Certified Industrial Hygienist (CIH). ... 
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    Robert E. Speights

    President, Industrial Services*
    Mr. Speights joined the Company in 2018, following a lengthy career in a variety of executive sales and operations roles. Robby was most recently with Aegion Corporation as SVP and Chief Sales Officer where he implemented strategic long-term growth plans for its 12 companies that accounted for more than $1.4 billion in revenue. Previously, he was Senior Vice President Business Development, Marketing, and Strategy and held operations for Safety Services at Transfield Services. Prior to Transfield, Robby held a variety of sales, business development and operations roles over a 20-year span at several industrial companies including Aquilex/Hydrochem, MPW Industrial and Dowell/Schlumberger Industrial Service. He attended University of Southern Mississippi and Pearl River College earning an Associate of Science with concentration in Electronics followed by getting accepted into Dowell/Schlumberger’s field engineering program. ... 
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    Rebecca Underwood

    President, Facilities*
    Ms. Underwood joined the Company in 2022 as EVP, President of Facilities. Most recently, she was Senior Vice President - Safety, Operations, Maintenance, Engineering, Productivity at Covanta. Previously she was Vice President, Integrated Supply Chain – Advanced Materials for Honeywell. Prior to that, Ms. Underwood spent more than a decade holding a variety of senior management roles at Air Products based in both the U.S. and China concluding as Director of Global Product Supply. In between her various roles at Air Products, she was the Asia Pacific Operations Director for Ferro Corporation. Ms. Underwood holds a Bachelor of Science degree in Mechanical Engineering from University of Illinois Urbana-Champaign. She earned her Executive MBA from WUSL-Fudan University. ... 
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    Brian P. Weber

    President, Safety-Kleen Sustainability Solutions
    Mr. Weber was named Executive Vice President and President of Safety-Kleen Sustainability Solutions in March 2023, after serving as the Company’s Executive Vice President, Corporate Planning and Development. Mr. Weber joined Clean Harbors in 1990 and has held a variety of senior management positions with the Company including Senior Vice President of Transportation, Vice President of CleanPack Services, and Vice President, Technical Services. Mr. Weber received a Bachelor of Science degree in Business Management from Westfield State College. ... 




*Officer of a wholly-owned subsidiary of the parent holding company, Clean Harbors, Inc.
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