Sam Callahan focuses on appellate and complex civil litigation in state and federal courts. He has represented individuals, businesses, and foreign governments in the Supreme Court and federal appellate courts, and has briefed issues ranging from administrative law to sovereign immunity to novel questions under the First Amendment.

Mr. Callahan joined the firm in 2018 after serving as a law clerk to the Honorable Paul V. Niemeyer of the United States Court of Appeals for the Fourth Circuit and the Honorable Christopher R. Cooper of the United States District Court for the District of Columbia. He is a magna cum laude graduate of Harvard Law School, where he served as an Executive Editor of the Harvard Law Review.

Experience

  • Immigration-rights organizations at the US Supreme Court in successful challenge to the attempted addition of a citizenship question to the 2020 Census. Department of Commerce v. New York, 139 S. Ct. 2551 (2019).
  • Medical device manufacturer in pending Seventh Circuit appeal of $20 million trial verdict.
  • Foreign government in action attempting to enforce a billion-plus-dollar judgment through attachment of sovereign assets. Obtained stay of enforcement proceedings in district court.
  • Voters and political groups in successful partisan gerrymandering challenge to North Carolina’s state legislative districts. Helped draft post-trial briefing that led to landmark decision under North Carolina constitution.

Credentials

Education
  • JD, Harvard Law School, 2016, magna cum laude
  • BM/BA, Trumpet Performance and Economics, Indiana University, 2013, Phi Beta Kappa
Admissions
  • District of Columbia
  • Maryland
  • US Court of Appeals for the Second Circuit
  • US Court of Appeals for the Third Circuit
  • US Court of Appeals for the Fourth Circuit
  • US Court of Appeals for the Seventh Circuit
  • US District Court, District of Columbia
  • US Court of Appeals for the Ninth Circuit
  • US District Court, District of Maryland
Clerkships
  • US Court of Appeals for the Fourth Circuit, The Honorable Paul V. Niemeyer
  • US District Court, District of Columbia, The Honorable Christopher R. Cooper
Overview

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