O'Scannlain, Judge Diarmuid
JUDGE Diarmuid O’Scannlain is a United States circuit judge for the Ninth Circuit in Portland, Oregon.
A native New Yorker, O’Scannlain received a BA from St. John’s University, a JD from Harvard and an LL.M from the University of Virginia School of Law.
As a judge on the U.S. Court of Appeals for the Ninth Circuit, O’Scannlain has participated in over 6,000 federal cases and has written hundreds of published opinions on a broad range of subjects, including constitutional law, securities law, administrative law and criminal law.
President George W. Bush appointed O’Scannlain to the Board of Trustees of the James Madison Memorial Fellowship Foundation in 2004. Pope Benedict XVI conferred the Order of Saint Gregory the Great on O’Scannlain and his wife Maura in 2007.
O’Scannlain is an adjunct professor at the Northwestern School of Law of Lewis & Clark College, where he teaches seminars on the Supreme Court and Appellate Practice.
O’Scannlain’s parents came to the U.S. from counties Sligo and Derry. The O’Scannlains have eight children and 14 grandchildren.
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