Peter Karanjia is chair of DLA Piper's Administrative Law Appellate practice. Drawing on his experience as Deputy General Counsel of the Federal Communications Commission (2010 – 2013) and Special Counsel to the Solicitor General of New York (2007 – 2010), Peter focuses on appellate, regulatory, and complex civil litigation.

Law360 has selected Peter four times (including as recently as 2022) as an MVP of the Year for his "successes in high-stakes litigation." Chambers USA notes that Peter "has a broad range of experience in representing clients in high-stakes courtroom proceedings," adding that he is "widely regarded as one of the go-to folks for appellate work" and "is a tremendous intellect with strong litigation knowledge" (2025 and 2019 editions). The Legal 500 United States similarly describes Peter as a "[l]eading partner" (2025) and "an expert appellate and civil litigator" (2022). Washingtonian magazine (2024) identifies Peter as a "Top Lawyer," and Lawdragon (2025) features Peter among "500 Leading Litigators in America" in the categories of appellate and complex commercial litigation.

Peter has extensive experience handling government-facing litigation and enforcement matters, including appeals and trial court litigation involving constitutional issues, federal preemption, and privacy and cybersecurity matters. He has successfully briefed and argued major appeals covered in The New York Times, The Washington Post, and other national publications. In addition, Peter has handled high-stakes challenges to government action in trial courts across the country, including a recent First Amendment challenge to Florida's first-of-its-kind social media "deplatforming" law, which restricts moderation practices by a wide variety of online services providers.

Peter is also actively involved in pro bono and civic work, including regularly filing amicus briefs in the United States Supreme Court on behalf of members of Congress, bar associations and government officials. He serves on (and is a past chair of) the national board of the American Constitution Society and is an elected member of the American Law Institute (which publishes Restatements of the Law, Model Codes, and Principles of Law).

Court upholds New York AG's Martin Act authority to investigate virtual currency fraud