John Gretton "Jocko" Willink (born September 8, 1971) is an American retired officer of the United States Navy, who served in the Navy SEAL teams. He is also a podcaster and author. His military service saw combat actions in the war in Iraq, where he eventually commanded the SEAL Team 3's Task Unit Bruiser that fought in the battle against the Iraqi insurgents in Ramadi, and was honored with the Silver Star and Bronze Star for his service. He achieved the rank of Lieutenant Commander.
Willink co-authored the books Extreme Ownership and The Dichotomy of Leadership (with fellow retired SEAL Leif Babin) and co-founded the management consulting firm Echelon Front, LLC. Willink hosts a weekly podcast with Brazilian jiu jitsu practitioner Echo Charles, called the Jocko Podcast.