Henry D. Sokolski is the Executive Director of the Nonproliferation Policy Education Center, a Washington-based nonprofit organization founded in 1994 to promote a better understanding of strategic weapons proliferation issues among policymakers, scholars and the media. He was appointed by the U.S. Congress to serve on the Commission on the Prevention of Weapons of Mass Destruction Proliferation and terrorism, which filed its final report in December of 2008.

Sokolski served from 1989 to 1993 as the Deputy for Nonproliferation Policy in the Office of the Secretary of Defense, and later received the Secretary of Defense's Medal for Outstanding Public Service. Prior to this, he worked in the Secretary's Office of Net Assessment on proliferation issues.

In addition to his Executive Branch service, Sokolski served from 1984 through 1988 as Senior Military Legislative Aide to Senator Dan Quayle, and as Special Assistant on Nuclear Energy Matters to Senator Gordon J. Humphrey from 1982 through 1983.