 Professor Finkelman has also been part of "amicus curiae" briefs for cases related to Guantanamo Bay detainment camp, gay marriage in New York State, affirmative action, and separation of church and state.In 2013, he was the lead named amicus in briefs before the Supreme Court involving affirmative action ("Schuette v. Coalition to Defend Affirmative Action") and prayer delivered at public meetings ("Town of Greece v. Galloway").The U.S Supreme Court has cited Finkelman five times, including in Justice Ruth Bader Ginsburg's majority opinion in "Timbs v. Indiana" (2019).