Father O’Brien is a professor of law emeritus at the Catholic University of America, where he previously served as assistant dean for admissions and student affairs. He was an attorney for the Small Business Administration, served as a captain in the United States Army, and a trustee for the Law School Admission Council. He was a member of the National Institute of Allergy and Infectious Diseases National Advisory Allergy and Infectious Diseases Council. Father O’Brien has a wide range of teaching experience, including adjunct positions at law schools at George Mason, American University, St. Mary’s University in San Antonio, and Loyola, Los Angeles. Currently a visiting professor at the Law Center, Father O’Brien has also taught at the Law Center as an adjunct and as a visiting associate professor. In addition to numerous law review articles, he is the author of Long Term Care: Private, State and Federal Options for the Future (1997) (with Michael Flannery) and Domestic Relations: Cases and Materials (9th ed. 2021) (with Walter Wadlington and Robin Fretwell Wilson), Family Law Statutes, International Conventions and Uniform Laws, (2021) (with Robin Fretwell Wilson), and Family Law in Perspective, (5th ed. 2021) (with Robin Fretwell Wilson). He is also the co-author of Decedents’ Estates (4th ed. 2020) (with Michael Flannery), The Prudent Investing of Trusts (2009) (with Michael Flannery), The Fundamentals of Elder Law (2015) (with Michael Flannery), and The Sexual Exploitation of Children (2016) (with Michael Flannery).