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Christopher Landau is an American attorney and diplomat who served as the United States Ambassador to Mexico from 2019 to 2021 under President Donald Trump. He is a graduate of Harvard College and Harvard Law School, and clerked for Supreme Court Justices Antonin Scalia and Clarence Thomas. Landau has had a distinguished legal career, including work as a partner at Quinn Emanuel Urquhart & Sullivan and arguing numerous cases before the Supreme Court.