In addition to his appellate and Supreme Court work for clients of the firm, Mark has participated in more than 30 Supreme Court cases as counsel for the Catholic Bishops, as well as other religious groups, in friend-of-the-court briefs. He is also nationally known for his work on the liability of nonprofit entities and protection of religious institutions.
Since 2003, Mark has served as an adjunct professor of law at Georgetown University Law Center where he teaches a seminar on church-state law. He has lectured widely in the United States and in Europe on such topics as liability trends, church-state relations and legal ethics at conferences hosted by bar associations, colleges and universities, lawyer guilds and religious organizations. Mark routinely publishes articles that address legal trends and organizational concerns on such topics as church-state affairs, education, bioethics and liability. He is co-author of “Exposed: A Legal Field Guide for Nonprofit Executives,” which was written to assist nonprofit executives in identifying legal issues that can arise in ordinary business activities and to take the fear and mystery out of dealing with legal issues when problems occur. He previously served as an adviser to an American Law Institute project on stating the law of nonprofit organizations.
During his tenure with the USCCB, Mark led a seven-lawyer staff that handled comprehensive litigation, corporate, tax, intellectual property, employment and government contracts services. He was also the public contact for the USCCB on all legal matters, including church-state, Supreme Court cases, bankruptcy, complex litigation and bioethics.
During his government service with the Nuclear Regulatory Commission, Mark served in the Office of General Counsel where he advised the Commissioners on legal requirements related to nuclear power plants and other uses of radioactive substances as they affected questions of public health and safety, and defended the Commission in federal, district and appellate courts.