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Company Executives

Management Team

From the 10-K annual report
Officer Age In this role Joined Pay Source
Rod Baltzer Also a director
Director, President and Chief Executive Officer
 57 Not stated 2018 Not reported
Joseph Nelson
Chief Financial Officer and Treasurer
 42 Since 2026
this year
 Not stated Not reported
Chris Parker
Chief Commercialization Officer
 57 Since 2024
2 years
 Not stated Not reported
Paula Whitten-Doolin
GC and Corporate Secretary
Title from the Form 4 dated Oct 6, 2026
 46 Not stated Not stated Not reported
Christopher Lombard Parker
CCO
Title from the Form 4 dated Oct 6, 2026
 Not stated Not stated Not stated Not reported
Jesse Sloane
Executive Vice President of Engineering
 44 Since 2022
4 years
 2022 Not reported
Sophie McCallum
Chief of Staff
 38 Since 2018
8 years
 2018 Not reported
Steve Airhart
President-FES
Title from the Form 4 dated Oct 6, 2026
 63 Not stated Not stated Not reported

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.

Board of Directors

From the proxy statement filed Apr 29, 2026
Directors
7
serving now
Independent
5 of 7
stated in the proxy
Average tenure
1.0 years
from year joined
CEO also chairs the board
Not stated
no chair stated
Director Age On board Independent Committees Other public boards 2025 pay Source
Rod Baltzer
CEO
 57 2025
1 year
 Not independent None stated None stated Paid as CEO
Renee Hornbaker
73 2025
1 year
 Independent None stated Eastman Chemical Company, The Freeman Company $148,000
Christa Steele
51 2025
1 year
 Independent None stated Global Water Resources $146,125
Leslie Goldman Tepper
Not stated Not stated Independent
Audit Committee
None stated $167,875
Jonathon Angell
Not stated Not stated Independent
Audit Committee · Chair
None stated $167,250
Elizabeth Muller
Not stated Not stated Not independent None stated None stated $166,000
Ralph L. Hunter
Not stated Not stated Independent None stated None stated Not stated

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.

Related-party transactions

5 disclosed in the proxy filed Apr 29, 2026
NAC International
NAC International held greater than 5% of Deep Isolation's pre-Merger capital stock; Mr. Cole, its President and Chief Executive Officer, was a director of Deep Isolation
Amount not stated

Cooperation and Licensing Agreement for collaboration on development and commercialization of UCS canisters; no payments made under it in fiscal 2024; amended July 29, 2025 to designate NAC International as exclusive provider for above-ground storage UCS canisters

With Deep Isolation Open in proxy
NAC International
NAC International held greater than 5% of Deep Isolation's pre-Merger capital stock; Mr. Cole, its President and Chief Executive Officer, was a director of Deep Isolation
Maximum amount of funding available under the award is $836,781.00
through years ended December 31, 2024

ARPA-E Subaward Agreement under which Deep Isolation as Prime Recipient and NAC International as Sub-recipient collaborate on advanced reactor waste canister development; maximum funding under the award is $836,781.00, with $807,304 spent through December 31, 2024

With Deep Isolation Open in proxy
NAC International
NAC International held greater than 5% of Deep Isolation's pre-Merger capital stock; Mr. Cole, its President and Chief Executive Officer, was a director of Deep Isolation
Approximately £21,860 (approximately $27,918)
effective November 24, 2022

Collaboration Agreement on a high-tech borehole canister research project under the UK Energy Entrepreneurs Fund; NAC International received the benefit of approximately £21,860 of the grant amount; agreement expired November 23, 2024

With Deep Isolation EMEA Limited, Deep Isolation, Inc., the University of Sheffield Open in proxy
Deep Borehole Demonstration Center (DBDC)
Chair of Deep Isolation's board, Ms. Muller, serves on the board of the DBDC; Messrs. Baltzer and Parker serve as the DBDC's Treasurer and Secretary
$43,000
fiscal year ended December 31, 2025

Administrative Support Services Agreement under which the DBDC pays Deep Isolation for services rendered by the Secretary and Treasurer and other administrative and support services

With Deep Isolation Open in proxy
Deep Fission
Elizabeth Muller is co-founder, CEO and a director of Deep Fission, a nuclear energy company and customer of Deep Isolation
Amount not stated
since January 1, 2023

Deep Isolation has contracted with Deep Fission to provide de minimis consulting and administrative support services

With Deep Isolation Open in proxy

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