Robbins, Russell, Englert, Orseck, Untereiner & Sauber LLP

Peter B. Siegal, Associate


J.D., magna cum laude, Northwestern University School of Law, 2012

Order of the Coif

Senior Articles Editor, Northwestern University Law Review

B.A., University of Wisconsin – Madison, 2008


Tel: 202.471.3049
Fax: 202.775.4510

Bar Associations

District of Columbia


Peter B. Siegal, Associate

Appellate Briefs

Raytheon v. United States Brief of Defendant-Appellee

Trial Memoranda

Raytheon v. United States Defendant-Intervenor's Cross-Motion for Judgment
Raytheon v. United States Defendant-Intervenor's Reply Brief

Peter B. Siegal is a litigator who represents clients in a diverse range of matters in federal and state courts.  Among his clients are energy producers, hedge funds, Big Four professional services firms, Fortune 500 government contractors, health services providers, and pharmaceutical companies.  Peter maintains a particular interest, and an active practice, in the United States Courts of Appeals and the Supreme Court, where he has represented parties and amici at both the certiorari and merits stages.

Before joining Robbins Russell, Peter served as a law clerk to the Honorable William J. Kayatta, Jr., of the United States Court of Appeals for the First Circuit.  Prior to that, Peter attended the Northwestern University School of Law, from which he received his J.D., magna cum laude.  Peter is an alumnus of the Northwestern University Law Review, on which he served as the Senior Articles Editor, and of Northwestern's Supreme Court Litigation Clinic.  While in law school, he was elected to the Order of the Coif and published scholarly work in both the Texas Law Review and the Northwestern University Law Review.

Representative matters include:

  • Successfully represented Universal Health Services, Inc. in False Claims Act litigation before the Supreme Court of the United States.  See Universal Health Services, Inc. v. United States ex rel. Escobar, No. 15-7, 2016 WL 331756 (U.S. June 16, 2016).

  • Wrote multiple winning briefs for Northrop Grumman in its successful challenge to the award of a high-dollar-value United States Air Force contract.  The briefs persuaded the Government Accountability Office to recommend that the Air Force re-bid the contract, and later helped sustain the GAO's recommendation, and the Air Force's decision to re-bid the contract, in the face of challenges in the United States Court of Federal Claims and the United States Court of Appeals for the Federal Circuit.  See Raytheon Co. v. United States, 809 F.3d 590 (Fed. Cir. 2015).

  • Currently representing Erie Boulevard Hydropower, L.P., an affiliate of Brookfield Renewable Partners, L.P., in its challenge to an order of the Federal Energy Regulatory Commission.  Erie’s petition is pending before the United States Court of Appeals for the D.C. Circuit.

  • Currently representing affiliates of Aurelius Capital Management in their Delaware Chancery suits against Sprint and SoftBank challenging Sprint's acquisition of Clearwire Corporation.  The Vice Chancellor has denied the defendants' motion to dismiss.

  • Defended a Fortune 500 company in shareholder litigation arising out of the Deepwater Horizon oil spill in the Gulf of Mexico.

  • Represented a large pharmaceutical firm against allegations of price fixing in a multidistrict, federal class action.

  • Represented a New York Times bestselling author in a state-court appeal of his homicide conviction.

  • Provided numerous clients with strategic counseling and advice on matters such as issue preservation, whether to bring cases, and which issues to raise on appeal.

  • Represented clients in alternative dispute resolution proceedings, including mediations, to highly favorable outcomes.