Brent Greenfield is named as a lobbyist on federal disclosure filings for 8 clients through Cornerstone Government Affairs, Inc.. The most recent filing naming them posted in October 2026. Issues reported include Natural Resources, Energy/Nuclear, Trade (domestic/foreign) and Defense.
Filers must list covered executive or legislative branch positions held. As filed:
| Client | Registrant | Latest | Issues |
|---|---|---|---|
| AMERICAN CRITICAL MINERALS ASSOCIATION | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q3 2026 | Trade (domestic/foreign), Taxation/Internal Revenue Code, Natural Resources |
| TRANSOCEAN OFFSHORE DEEPWATER DRILLING INC. | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q3 2026 | Natural Resources |
| STATE OF HAWAII DEPARTMENT OF ENERGY | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q3 2026 | Natural Resources, Energy/Nuclear, Environment/Superfund |
| FIRST SERVICE CREDIT UNION | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q3 2026 | Financial Institutions/Investments/Securities, Banking |
| EAGLE ENERGY METALS CORP. | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q4 2025 | Budget/Appropriations, Natural Resources, Defense |
| LOUISIANA ENERGY SERVICES, LLC DBA URENCO USA | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q4 2025 | Trade (domestic/foreign), Energy/Nuclear |
| GLOBAL SEA MINERAL RESOURCES NV | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q3 2025 | Natural Resources, Energy/Nuclear, Marine/Maritime/Boating/Fisheries |
| BAKER HUGHES COMPANY | CORNERSTONE GOVERNMENT AFFAIRS, INC. | Q2 2025 | Taxation/Internal Revenue Code, Energy/Nuclear, Environment/Superfund |
| Year | Clients | Registrants |
|---|---|---|
| 2026 | 4 | 1 |
| 2025 | 7 | 1 |
| Year | Items | Total |
|---|---|---|
| 2026 | 2 | $2K |
Pay is not disclosed for individual lobbyists. Filings do not confirm that records with the same name are one person, so this page may combine people who share the name Brent Greenfield. See the Capitol Clarity rankings and method.