Marc Alexander Thiessen (born January 13, 1967) is an American conservative author, political appointee, and weekly columnist for The Washington Post.

[1] After graduating from college, Thiessen moved to Washington, D.C., where he has worked for many years, starting at the lobbying firm Black, Manafort, Stone and Kelly (BMSK) from 1989 to 1993.

[6] From 1995 to 2001, he served on Capitol Hill as spokesman and senior policy advisor to Senate Foreign Relations Committee Chairman Jesse Helms (R-NC).

[12] In 2020, he defended President Donald Trump’s decision to assassinate Iranian General Qasem Soleimani, saying it was "defensive, preemptive, and lawful.

[15] The book was endorsed by the former Vice President Dick Cheney, former Secretary of Defense Donald Rumsfeld, and former Attorney General Michael Mukasey.

began interrogating captured terrorists, Al-Qaeda has not succeeded in launching one single attack on the homeland or American interests abroad.

"[18] Mayer wrote, "This is not exactly a textbook demonstration of causality", and noted that Thiessen's claim was false anyway; Al-Qaeda had launched numerous attacks targeting Americans since the start of the torture program.

[22] Thiessen lives in Alexandria, Virginia, with his wife Pamela, who is the Staff Director of the United States Senate Republican Policy Committee.