O'Brien met Elizabeth Ann "Liza" Powel in 2000, when she appeared on Late Night with Conan O'Brien in an advertising skit involving Hilton Furniture and Foote, Cone & Belding, where she worked as senior copywriter. The couple dated for nearly 18 months before their 2002 marriage in Powel's hometown of Seattle. O'Brien and Powel have a daughter, Neve (born 2003) and a son, Beckett (born 2005).O'Brien often affirms his Irish Catholic heritage. On a 2009 episode of Inside the Actors Studio, he stated that ancestors from both sides of his family moved to America from Ireland starting in the 1850s, subsequently marrying only other Irish Catholics, and that his lineage is thus 100% Irish Catholic. His entirely homogenous ancestry was confirmed via DNA test a decade later, which he shared on The Late Show with Stephen Colbert. O’Brien noted that being entirely descended from just one ethnic group is extremely rare, and that him being so “shocked” his doctor.He has been a registered Democrat since casting his first vote for president in 1984 for Walter Mondale. He considers himself a moderate on the political spectrum. O'Brien founded the anti-hunger organization Labels Are For Jars with his friend and former Harvard dormmate Father Paul B. O'Brien. He also helped open the Cor Unum meal center in 2006.Starting in September 2006, O'Brien was stalked by Father David Ajemian of the Archdiocese of Boston, who, despite multiple warnings to stop, sent O'Brien letters signed as "your priest stalker". Ajemian later sent O'Brien death threats and tried to forcefully enter a taping of Late Night before being arrested. On April 8, 2008, Ajemian pleaded guilty to stalking, and was later laicized.In January 2008, after his show was put on hold for two months owing to the strike by the Writers Guild of America, he reemerged on late-night TV sporting a beard, which guest Tom Brokaw described as making him look like "a draft dodger from the Civil War." After leaving The Tonight Show with Conan O'Brien in 2010, O'Brien again grew a beard, which he kept until May 2011, when it was partially shaved on the set of Conan by Will Ferrell (and completely shaved off-screen by a professional barber).O'Brien purchased a $10.5-million mansion in Brentwood, Los Angeles, California, to prepare for his move there in 2009 from New York City to host The Tonight Show at Universal Studios Hollywood. As part of a long-running gag, he brought his 1992 Ford Taurus SHO with him to California, showcasing it on both the inaugural episodes of The Tonight Show and Conan.On June 12, 2011, O'Brien was awarded an honorary Doctor of Arts degree from Dartmouth College. In addition to the honorary degree, he delivered the commencement speech. On October 21, 2011, O'Brien was ordained as a minister by the Universal Life Church Monastery, allowing him to perform a same-sex marriage while back in New York, then one of the few states in the US where gay marriage was legal, to tape a week's worth of shows. The wedding, between a member of O'Brien's staff and his partner, was held on the stage of the Beacon Theatre on November 3, 2011, and broadcast on Conan. The same-sex marriage ceremony was the first to be broadcast on American late night television.