Jim Mattis

James Norman Mattis is a retired United States Marine Corps four‑star general who served as the 26th Secretary of Defense from 2017 to early 2019 under President Donald Trump. A career officer noted for his intellectual rigor, Mattis commanded U.S. forces in several major conflicts, including the Gulf War, the war in Afghanistan, and the Iraq War. After retiring from active duty he entered the private sector before being nominated by the president-elect to lead the Department of Defense.

Early life and career

Mattis was born on September 8, 1950, in Pullman, Washington. His mother, Lucille (Proulx) Mattis, immigrated to the United States from Canada as an infant and served in Army Intelligence in South Africa during World War II. His father, John West Mattis, worked at a plant that supplied fissile material for the Manhattan Project after moving to Richland, Washington. The family lived in a book‑filled home that did not own a television, fostering an early appreciation for reading and learning.

He graduated from Richland High School in 1968 and earned a Bachelor of Arts in history from Central Washington University in 1971. In 1994 he completed a Master of Arts in international security affairs at the National War College of the National Defense University.

Mattis began his military career by enlisting in the Marine Corps Reserve in 1969. He was commissioned as a second lieutenant through the Naval Reserve Officers’ Training Corps on January 1, 1972. During his service he became known among senior officers for his intellectualism and polished demeanor; retired Army Major General Robert H. Scales described him as “one of the most urbane and polished men I have known.”

His early assignments included platoon leadership in the 3rd Marine Division and battalion officer duties at the Naval Academy Preparatory School, the 1st Marine Regiment, and Recruiting Station Portland, Oregon. As a major he served at recruiting station Portland before being promoted to lieutenant colonel, when he commanded the 1st Battalion, 7th Marines—an assault battalion that participated in Operation Desert Storm as part of Task Force Ripper.

Promoted to colonel, Mattis led the 7th Marine Regiment from June 28, 1994, to June 14, 1996. He is a graduate of the U.S. Marine Corps Amphibious Warfare School, the Marine Corps Command and Staff College, and the National War College. His scholarly interests in military history and world culture were reflected in his personal library, which once contained more than 7,000 volumes. He frequently required Marines under his command to study regional histories and cultures, and he instituted cultural sensitivity training for units deploying to Iraq.

Mattis earned the nickname “Mad Dog” during his early career, a moniker that later proved misleading; when asked by President‑elect Trump in 2016 whether it was his true nickname, Mattis replied that his actual call sign was “Chaos,” an acronym for “Colonel Has Another Outstanding Solution.”

Cabinet tenure

Mattis’s senior operational commands included leadership of the U.S. Joint Forces Command from 2007 to 2010, during which he also served concurrently as NATO’s Supreme Allied Commander Transformation. From 2010 to 2013 he commanded United States Central Command; Admiral Bob Harward was his deputy commander.

After retiring from active duty, Mattis held several private‑sector positions, including a board seat at Theranos. In November 2016 President‑elect Donald Trump nominated him as Secretary of Defense. The Senate confirmed the nomination on January 20, 2017, and Mattis assumed office that day.

During his tenure he reaffirmed U.S. commitments to key allies, most notably South Korea in the wake of North Korean provocations in 2017. He expressed concerns about cooperation with China and Russia, describing their actions as a threat to the American‑led world order. Mattis publicly disagreed with several administration policies, including the withdrawal from the Iran nuclear deal, troop withdrawals from Syria and Afghanistan, and budget cuts that he believed would impede climate‑change monitoring efforts. According to reports, he also advised President Trump against attempting to assassinate Syrian President Bashar al‑Assad.

On December 20, 2018 Mattis announced his resignation, citing a failure to persuade the president to reconsider the decision to withdraw all U.S. troops from Syria. He had indicated that his departure would be effective at the end of February 2019; however, Trump accelerated the transition, and Mattis left office on January 1, 2019.

Legacy

Mattis is remembered for blending scholarly depth with operational experience. His emphasis on reading and cultural awareness influenced the professional development of Marines under his command, while his insistence on strategic thinking shaped U.S. military doctrine during a period of evolving global threats. As Secretary of Defense he maintained clear lines of communication with allies and expressed caution regarding foreign policy moves that could destabilize established security arrangements.

His tenure was marked by both support for traditional defense commitments—such as the alliance in South Korea—and willingness to challenge executive decisions that he believed contradicted long‑standing U.S. interests. Mattis’s resignation, prompted by disagreements over troop withdrawals from Syria, underscored his commitment to a measured approach to foreign engagements.

In the private sector, his board service at Theranos added a civilian dimension to an otherwise military‑focused career. Overall, Mattis’s legacy is that of a disciplined strategist who valued intellectual preparation as much as battlefield readiness, and who sought to balance national security priorities with principled policy positions during a turbulent period in U.S. defense history.