Career
Metropolitan Police Department and clerkships (2005–2010)
By April 2005, Siebert had been working for the Metropolitan Police Department of the District of Columbia. In October, he married Anne Gray Cullen, a kindergarten teacher for Fairfax County Public Schools. [3] Cullen's father is Richard Cullen, the counselor to the governor of Virginia, Glenn Youngkin, and the state's former attorney general and United States attorney. [5] Siebert served as a patrol officer and a vice investigator for the Metropolitan Police Department before resigning to pursue a Juris Doctor from the University of Richmond School of Law. [4] He graduated in 2009. [6] Siebert interned for judge Henry E. Hudson, magistrate judge M. Hannah Lauck, and the City of Richmond Commonwealth Attorney's Office. [4]
U.S. Attorney's Office for the Eastern District of Virginia
In November 2010, Neil MacBride, the United States attorney for the Eastern District of Virginia, named Siebert as an assistant U.S. attorney for the office's Richmond division. [4] In 2019, he became the deputy criminal supervisor for the Richmond division. [7]
U.S. Attorney for the Eastern District of Virginia (January–September 2025)
In the second presidential transition of Donald Trump, advisors to the governor of Virginia, Glenn Youngkin, recommended Siebert. [5] He took office on January 21, 2025, [6] following Trump's inauguration, [7] succeeding Jessica Aber. [6] As Siebert's four-month set tenure neared, Virginia's senators, Tim Kaine and Mark Warner, recommended Trump nominate Siebert to retain him. [5] The following month, federal judges in the district unanimously voted to keep Siebert in his position [7] and Trump nominated him. [5] The Senate Committee on the Judiciary voted in September to advance his nomination. [5]
As U.S. attorney, Siebert worked with Emil Bove, the acting U.S. deputy attorney general and principal associate deputy attorney general, on immigration and gang cases. He was respected by several officials in the Trump administration and in Congress, including Iowa senator Chuck Grassley, the chair of the Committee on the Judiciary. [7]
In September, ABC News reported that Trump was expected to fire Siebert after investigators could not find sufficient evidence to indict Letitia James, the attorney general of New York, for mortgage fraud. [6] Bill Pulte, the director of the Federal Housing Finance Agency, initiated the plan to remove Siebert. On September 19, Trump gave an address from the Oval Office publicly calling for Siebert to be removed. [5] Hours later, Siebert resigned. [5] Trump rejected that assertion, claiming that he had fired Siebert before he could resign. [7] According to the Associated Press, Siebert was told to resign or be fired. [8] The following day, the Department of Justice named criminal defense lawyer Lindsey Halligan as his successor. [9]