[2] Rosen earned a Bachelor of Arts degree from the University of Colorado Boulder and a Juris Doctor from the USC Gould School of Law.

In 2010 and 2011, Rosen served as special assistant United States attorney for the Eastern District of Virginia.

[6][7] On March 8, 2022, President Joe Biden nominated Rosen to be an Assistant Secretary of the Treasury for Investment Security.

[9] On May 31, 2023, Rosen testified to the Senate Banking Committee on the U.S. economic security approach to China.

[10] In 2018, Rosen married Casey Hernandez, the vice president for content strategy at Herbalife Nutrition.