Thomas Mancinelli

Thomas J. Mancinelli is an American naval officer and politician who served as the acting United States Under Secretary of the Navy from 2024 to 2025 as part of the Biden administration. He served in the United States Marine Corps, being deployed to fight in the Anbar campaign during the Iraq War on two occasions.

Personal life Thomas Mancinelli lives in Washington, D.C., with his wife, Sarah, and his two children. at Antares, a Los Angeles startup that manufactures nuclear microreactors for defense and space applications. He and his CEO have argued that nuclear energy is critical to American space exploration and unlocking the celestial economy.