Justice Couriel started his career in 2003 as clerk for Judge John D Bates of the U.S. District Court. He helped with criminal, civil, and national security issues. In 2004, he entered private practice. He focused on cross-border internal investigations, often in Europe or Latin America. From 2009 to 2012, he was a federal prosecutor. At the time of his appointment to the Supreme Court, he was in private practice. In that role, he focused on cross-border disputes, mostly involving Latin America. He is expected to be a conservative justice. He is a textualist and has been a member of the Federalist Society since 2000.
Justice Couriel also ran for political office as a Republican twice, unsuccessfully. See his outlook on issues on his former campaign website.