Tadhg is a Partner in the firm’s Litigation Department, where he focuses his practice on appellate and complex civil litigation.

Tadhg has extensive experience handling appeals in state and federal courts throughout the country. He has briefed or argued appeals in the U.S. Supreme Court, most of the federal courts of appeal, and the high and intermediate appellate courts of nine states. Among other recent engagements, Tadhg was part of the team that obtained a unanimous reversal in the U.S. Supreme Court on behalf of a foreign sovereign and has successfully represented a major insurer in a series of high-stakes appeals in the Ninth Circuit and California concerning coverage for losses resulting from the COVID-19 pandemic. Along with Dave Roth, Tadhg directs Yale Law School’s Appellate Litigation Project, which has achieved a number of significant victories in the federal courts of appeals on behalf of indigent clients. Tadhg and Dave also collaborate on Wiggin and Dana’s widely read Supreme Court Update, keeping clients and friends of the firm apprised of every decision of the Supreme Court throughout the term.

At the trial level, Tadhg has represented clients confronting a variety of legal challenges, including defamation and libel suits, consumer class actions, insurance disputes, and alleged Title IX violations. He has particular expertise in media and First Amendment law, having defended both national and local news organizations in defense of defamation suits and responses to subpoenas. Tadhg prevailed in one of the first cases to test Connecticut’s “anti-SLAPP” statute and has frequently litigated the scope and application of that statute in state court. Tadhg has also counseled and represented municipalities and officials in connection with election law, as well as universities and other nonprofits in connection with institutional responses to sexual abuse.

Tadhg has devoted significant time to pro bono matters at the trial and appellate levels, focusing in particular on the rights of incarcerated persons. He is the appointed co-chair of Connecticut’s Correction Advisory Committee and serves on the Executive Committee of Connecticut Legal Services.

Tadhg joined Wiggin and Dana following a clerkship with Judge José A. Cabranes of the U.S. Court of Appeals for the Second Circuit. He previously clerked for Judge Robert N. Chatigny of the U.S. District Court for the District of Connecticut.