Semper received a Bachelor of Arts from Hampton University in 2003 and a Juris Doctor from Rutgers Law School in 2007.

[2] Semper served as a law clerk for Judge Harold Fullilove of the Essex County Superior Court from 2007 to 2008.

[2] During his time as an Assistant U.S. Attorney, Semper headed the Organized Crimes and Gangs section.

Brown, a convert to Islam and jihadi, in 2018 was convicted of multiple murders that occurred in 2014 in Seattle, Washington, and West Orange, New Jersey.

President Biden nominated Semper to the seat vacated by Judge John Michael Vazquez, who resigned on September 8, 2023.