John Demers

John Charles Demers is an American attorney who served as the United States Assistant Attorney General for the National Security Division from February 2018 until June 2021. During that period he was responsible for overseeing the Department of Justice’s national‑security litigation, surveillance programs, and counterintelligence operations. On January 20 2021, following the resignation of Acting Attorney General Jeffrey Rosen, Demers briefly held the office of United States Attorney General in his capacity as Assistant Attorney General for the National Security Division until a new acting attorney general was appointed later that day.

Early life and career

Demers was born on 21 September 1971 in Gubbio, Italy. His parents, Pina and Frank Demers, were teachers, and he grew up in a family that valued education. He attended the College of the Holy Cross in Worcester, Massachusetts, where he studied political science and Italian studies. In 1993 he graduated with a Bachelor of Arts degree magna cum laude, was inducted into Phi Beta Kappa and the Jesuit honor society Alpha Sigma Nu, and received the college’s Maurizio Vannicelli Prize.

After completing his undergraduate education, Demers earned a Watson Fellowship that enabled him to study in Italy. He then worked as a research assistant for the National Center on Addiction and Substance Abuse at Columbia University before enrolling at Harvard Law School in August 1996. While at Harvard he was a classmate of John P. Carlin, who would later serve as acting United States Deputy Attorney General. Demers graduated from Harvard Law School with a Juris Doctor magna cum laude in May 1999.

Following law school, Demers served as a clerk for Judge Diarmuid O’Scannlain of the U.S. Court of Appeals for the Ninth Circuit from 1999 to 2000. He had previously clerked at the United States Attorney’s Office for the District of Massachusetts in 1997 and spent a summer in 1998 as an associate at Simpson Thacher & Bartlett.

In October 2000, Demers joined the law firm Ropes & Gray as an associate attorney. The September 11 attacks prompted him to consider public service; he left Ropes & Gray in May 2003 to become an attorney advisor for the Office of Legal Counsel within the Department of Justice, a position he held until 2005. From 2005 to 2006 he clerked for Supreme Court Justice Antonin Scalia.

Demers’s career in national security law began with roles in the Department of Justice National Security Division (NSD). He served as senior counsel to the assistant attorney general from 2006 to 2007, then as counsel to the deputy attorney general from January 2007 to June 2007. From September 2007 to January 2009 he was Deputy Assistant Attorney General for the NSD.

In 2009 Demers transitioned to the private sector, joining Boeing in Arlington, Virginia. He first served as chief counsel for network and space systems until 2011, after which he became vice president and assistant general counsel for global, regulatory, and government law, a role he held through 2016.

Cabinet tenure

On 1 September 2017 President Donald Trump nominated Demers to be the United States Assistant Attorney General for the National Security Division. His nomination was reviewed by the Senate Judiciary Committee, which held a hearing on 31 October 2017. The committee reported his nomination favorably, and the full Senate confirmed him by voice vote in February 2018. He assumed office as assistant attorney general for the NSD on 22 February 2018.

As head of the National Security Division, Demers oversaw a range of responsibilities including U.S. surveillance law, representation before the Foreign Intelligence Surveillance Court, and counterintelligence operations. He worked closely with the Director of National Intelligence on matters related to the Foreign Intelligence Surveillance Act (FISA), contributing to the drafting of Section 702, and collaborated on Executive Order 12333. During his tenure he led the China Initiative, an effort focused on countering foreign influence in U.S. academia and research, and supervised counterespionage operations against foreign intelligence services.

Demers’s service spanned two presidential administrations. He was retained by President Joe Biden as the longest‑serving Senate‑confirmed official from the Trump administration to remain in a DOJ leadership position. On 20 January 2021, following the resignation of Acting Attorney General Jeffrey Rosen at noon, Demers served as acting United States Attorney General for several hours until Deputy Assistant Attorney General Monty Wilkinson was named acting attorney general later that day.

In June 2021, after the public disclosure of metadata seizures conducted by the Department of Justice between 2017 and 2018, Demers departed from his role in the National Security Division. He was succeeded by Matthew G. Olsen as assistant attorney general for the NSD.

Legacy

Demers’s career reflects a sustained engagement with national security law at both the federal government and private sector levels. His tenure as Assistant Attorney General for the National Security Division coincided with heightened scrutiny of U.S. surveillance programs, counterintelligence efforts against foreign influence, and the implementation of legal frameworks such as FISA Section 702 and Executive Order 12333. The China Initiative, which he led, represented a focused effort to address concerns about foreign interference in scientific research and higher education.

His brief service as acting United States Attorney General on 20 January 2021 underscores his status within the Department of Justice hierarchy and illustrates the continuity of leadership during transitions between administrations. After leaving government service, Demers returned to Boeing, where he had previously held senior legal positions, thereby continuing his involvement in matters related to defense, space, and security affairs.

Demers’s professional trajectory—from early clerkships and private practice to high‑level DOJ roles—highlights a career dedicated to the intersection of law and national security. His contributions have shaped the Department of Justice’s approach to surveillance, counterintelligence, and foreign influence operations over several years, leaving an imprint on the legal frameworks that govern U.S. national‑security policy.