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$CLH
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Company Executives

Officer Age In this role Joined 2025 pay Source
Michael L. Battles Also a director
Co-Chief Executive Officer and Co-President
57 Since 2023
3 years
2013 $5,927,812
Eric W. Gerstenberg Also a director
Co-Chief Executive Officer and Co-President
57 Since 2023
3 years
Not stated $5,929,422
Eric J. Dugas
Executive Vice President and Chief Financial Officer
48 Since 2023
3 years
2014 $1,904,153
Alan S. McKim Also a director
Founder, Executive Chairman of the Board, and Chief Technology Officer
71 Not stated Not stated $2,465,897
Sharon M. Gabriel
Executive Vice President and Chief Information Officer
50 Since 2018
8 years
2001 Not reported
Jeroen Diderich
EVP&President of Sales&Service
Title from the Form 4 dated Jun 1, 2026
58 Not stated 2024 $2,082,634
Rebecca Underwood
President, Facilities
52 Since 2023
3 years
2022 Not reported
George L. Curtis
EXEC. VICE PRESIDENT (CHESI)
Title from the Form 4 dated Jul 1, 2026
67 Not stated 1980 Not reported
Charles H. Geer II
Executive Vice President, Industrial Services
52 Not stated 2008 Not reported
Robert Harrison
Executive Vice President, Health & Safety
55 Not stated 2022 Not reported
Brian P. Weber
EVP (CHESI)
Title from the Form 4 dated Jul 1, 2026
58 Not stated 1990 $2,120,017

Each officer opens the passage of the filing that names them. A title that changed since the list comes from the officer's latest Form 3, 4 or 5, and its start year is not stated there. "Not stated" means the filing does not say. Pay is the proxy's Summary Compensation Table, which reports only the named executive officers.

Directors
13
serving now
Independent
10 of 13
stated in the proxy
Average tenure
12.6 years
from year joined
CEO also chairs the board
No
Alan S. McKim
Director Age On board Independent Committees Other public boards 2025 pay Source
Alan S. McKim
71 1980
46 years
Not independent None stated None stated Not stated
Michael L. Battles
57 2024
2 years
Not independent None stated Casella Waste Systems, Inc. (NASDAQ: CWST) Paid as CEO
Eric W. Gerstenberg
57 2024
2 years
Not independent None stated None stated Paid as CEO
Edward G. Galante
75 2010
16 years
Independent None stated Celanese Corporation (NYSE: CE) $334,987
Alison A. Quirk
64 2022
4 years
Independent None stated Janus Henderson Group plc (NYSE/ASX:JHG) $289,987
Shelley Stewart, Jr.
72 2022
4 years
Independent
Audit
Otis Worldwide Corporation (NYSE:OTIS), Kontoor Brands Inc. (NYSE:KTB) $269,987
John R. Welch
69 2014
12 years
Independent
Ad Hoc Cyber · Chair
None stated $284,987
Karyn Polito
59 2023
3 years
Independent
Audit
Beacon Financial Corporation (NYSE:BBT) $269,987
John T. Preston
76 1995
31 years
Independent None stated None stated $284,987
Marcy L. Reed
63 2021
5 years
Independent
Audit · Chair
Edison International (NYSE:EIX) $294,987
Andrea Robertson
68 2004
22 years
Independent
Audit
None stated $269,987
Lauren C. States
69 2016
10 years
Independent None stated Webster Financial Corporation (NYSE:WBS) $284,987
Robert J. Willett
58 2019
7 years
Independent
Compensation and Human Capital
None stated $269,987

Each director opens the passage of the proxy that names them. "Not stated" means the proxy does not say; it never means "no". Pay is the proxy's Director Compensation table; the CEO is paid as an executive.

3 disclosed in the proxy filed Apr 10, 2026
William McKim
son of Alan S. McKim, the Company's Executive Chairman of the Board and Chief Technology Officer
Approximately $1,251,000
2025

Compensation, including cash and equity awards granted during 2025, for his employment by a subsidiary of the Company, where he is an Executive Vice President.

With a subsidiary of the Company Open in proxy
Robert P. Smith
son-in-law of Alan S. McKim
Approximately $143,000

Compensation for his employment by a subsidiary of the Company.

With a subsidiary of the Company Open in proxy
Michael Platt
stepson of John T. Preston, an independent director of the Company
Approximately $223,000
2025

Compensation, including cash and equity awards granted during 2025, for his employment at a subsidiary of the Company.

With a subsidiary of the Company Open in proxy

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