Professor Matz is a Partner at Kaplan Hecker & Fink LLP. In February 2021, Professor Matz took a leave of absence from the firm to serve as Impeachment Counsel to the House Judiciary Committee for the second Senate trial of President Trump; he previously served among counsel to the House Judiciary Committee for the first impeachment and trial of President Trump. He has represented the Commonwealth of Pennsylvania in defending its certification of the results of the 2020 presidential election; ICE detainees challenging their confinement amid the COVID-19 pandemic; DC and Maryland in an Emoluments Clause lawsuit against President Trump; the House Judiciary Committee in its lawsuit to compel testimony by former White House Counsel Donald F. McGahn II; Leandra English in her challenge to Mick Mulvaney’s appointment as Acting Director of the CFPB; the Federal Defenders of New York in a challenge to Bureau of Prison attorney access restrictions; and Governor Andy Beshear of Kentucky in defending the constitutionality of a COVID-19 public health order temporarily suspending in-person K-12 education. In addition, Professor Matz has represented amici in litigation regarding President Trump’s travel ban, the ban on military service by transgender individuals, the addition of a citizenship question to the 2020 census, and the imposition of broad religious exemptions from the ACA’s contraceptive coverage requirement. Professor Matz is the co-author (with Larry Tribe) of Uncertain Justice: The Roberts Court and the Constitution (2014) and To End a Presidency: The Power of Impeachment (2018). From 2014 to 2015, he served as a law clerk to Justice Kennedy of the U.S. Supreme Court.