John Choon Yoo (born July 10, 1967) is a Korean-American attorney, law professor, former government official, and author.
Yoo is currently the Emanuel S.
Heller Professor of Law at the University of California, Berkeley, School of Law.
Previously, he served as the Deputy Assistant U.S.
Attorney General in the Office of Legal Counsel (OLC) of the Department of Justice, during the George W.
Bush administration.
He is best known for his opinions concerning the Geneva Conventions that attempted to legitimize the Bush administration's War on Terror.
He also authored the so-called Torture Memos, which provided a legal rationale for so-called "enhanced interrogation techniques", including waterboarding, which are widely considered torture.
In 2009, two days after taking office, President Barack Obama issued Executive Order 13491, repudiating and revoking all legal guidance on interrogation authored by Yoo and his successors in the Office of Legal Counsel between September 11, 2001, and January 20, 2009.