John Marck

John George Edward Marck (born 1982) (known professionally as John G.E. Marck) is an American lawyer who serves as a United States district judge of the United States District Court for the Southern District of Texas. He previously served as the acting United States attorney for the Southern District of Texas prior to becoming a judge.

Early life and education

Marck was born in 1982, in West Islip, New York. He received his Bachelor of Arts degree in 2009 from Brooklyn College and his Juris Doctor in 2013 from St. John's University School of Law.

Career

He worked as a security guard with ABM Security Services from 2009 to 2013, while attending law school. He began his career as an assistant district attorney for the Bronx County District Attorney and the Brooklyn District Attorney in New York City. From 2021 to 2026, he served as an assistant United States attorney in the Southern District of Texas, including as associate deputy criminal chief in 2025 and as first assistant United States attorney from 2025 to 2026, before becoming Acting United States attorney in 2026. In 2026, he served as the Acting United States Attorney for the Southern District of Texas. On June 24, 2026 the Senate invoked cloture on his nomination by a 52–45 vote and on the same day he was confirmed by the same 52–45 margin. He received his judicial commission on July 9, 2026.