Thiru Vignarajah attended Yale University and Harvard Law School, where he served as president of the Harvard Law Review. He went on to clerk for Supreme Court Justice Stephen G. Breyer, and then served as a federal prosecutor at the U.S. Attorney’s Office in Baltimore, working under then-U.S. Attorney Rod Rosenstein.
Vignarajah later moved to the Baltimore City State’s Attorney’s Office, where he headed the Major Investigations Unit. In 2014, he was appointed Deputy Attorney General for Maryland under Attorney-General Brian Frosh, a position he left to work on the transition team for Hillary Clinton’s 2016 presidential campaign.
In 2017, Vignarajah ran an unsuccessful Democratic primary campaign for Baltimore City State's Attorney. He is currently a litigation partner at the law firm DLA Piper in Baltimore.