A native of Indianapolis, Mary Catherine Martin earned three undergraduate degrees from Saint Louis University, graduating in 1999, then her law degree from Harvard Law School in 2003.  After law school, she clerked for Judge José A. Cabranes on the United States Court of Appeals for the Second Circuit in New York City.  After working for four firms in St. Louis over 15 years, specializing in drafting appellate briefs, Mary Catherine joined the Thomas More Society in 2018.  She lives in St. Louis with her seven children.