 In 2018, Hardiman held for the "en banc" court in "Rotkiske v. Klemm" that, contrary to decisions of the Fourth and Ninth Circuits, the statute of limitations under the Fair Debt Collection Practices Act begins to run when a violation of the Act occurs, not when the violation is later discovered.Before becoming a judge, Hardiman was a member of the bars of Pennsylvania, Massachusetts, and the District of Columbia.Since 2013, Hardiman has served as chair of the Committee on Information Technology of the Judicial Conference of the United States.