He is a member of the bars of the District of Columbia, Virginia, the U.S. Supreme Court, the 4th, 7th and 10th Circuits of the U.S. Courts of Appeals and the U.S. District Court for the District of Columbia. He was counsel of record of Supreme Court amicus briefs in Pleasant Grove City v. Summum, Salazar v. Buono, Christian Legal Society v. Martinez and Arizona Christian School Tuition Organization v. Winn; and court of appeals amicus briefs in Freedom From Religion Foundation v. Obama (7th Cir.) and American Atheists v. Duncan (10th Cir.). He served co-counsel in Newdow v. Roberts (Sup.Ct., cert. den. May 16, 2011) which challenged the infusion of religion into the 2009, 2013 and 2017 presidential inaugural ceremonies.