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Sibilla Grenon

Associate
Associate
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VCard

Areas of Focus

Overview

Sibilla Grenon is an associate in Crowell & Moring’s International Trade Group.

Before joining Crowell, Sibilla clerked for the Honorable Timothy M. Reif of the Court of International Trade, where she assisted Judge Reif in cases related to antidumping and countervailing duties, customs, and matters arising from the Court’s residual jurisdiction. Sibilla also assisted Judge Reif in the adjudication of cases before the Southern District of New York, notably in areas of trade secret and copyright law. Prior to her clerkship, Sibilla was an associate in the litigation group of a law firm where she represented clients on compliance issues concerning privacy and data security for large corporations in accordance with state, federal, and international privacy regulations (GDPR, CCPA, CPRA, TCPA, BIPA, and GLBA) and employment matters.   

Sibilla is a Rising Leader with the Aspen Strategy Group, a program that cultivates the next generation of rising leaders in national security and foreign policy.

As a law student, Sibilla served as the articles editor for the Georgetown Journal of International Law, a fellow at the Institute of International Economic Law, and was a member of Georgetown’s francophone moot court team of the Concours d’Arbitrage International de Paris. 

Career & Education

    • Department of State
      Law Clerk, Office of the Legal Advisor for International Claims and Investment Disputes, 2019–2020
    • Department of State
      Law Clerk, Office of the Legal Advisor for International Claims and Investment Disputes, 2019–2020

    • University of St. Andrews, B.A., First Class Honours, 2018
    • Georgetown University Law Center, J.D., 2021
    • University of St. Andrews, B.A., First Class Honours, 2018
    • Georgetown University Law Center, J.D., 2021

    • The Honorable Timothy M. Reif, U.S. Court of International Trade, 2022–2024
    • The Honorable Timothy M. Reif, U.S. Court of International Trade, 2022–2024

  • Professional Activities and Memberships

    • Rising Leader, Aspen Strategy Group

    Professional Activities and Memberships

    • Rising Leader, Aspen Strategy Group

    • French
    • French

Sibilla's Insights

Client Alert | 4 min read | 06.24.25

CBP Issues First Comprehensive Guide to Modifying a Withhold Release Order (WRO)

On June 2, 2025, U.S. Customs and Border Protection (“CBP”) issued its first ever Withhold Release Order (“WRO”) and Finding Modifications Guide (“Guide” or “the Guide”). The Guide serves as a roadmap for importers facing a possible WRO or Finding due to allegations of forced labor in the supply chain of their goods imported into the U.S. It provides guidance on information to be included in a modification petition, identifies possible cases in which CBP might request additional information, and provides resources for importers facing a WRO or Finding....

View All Insights

Practices

Sibilla's Insights

Client Alert | 4 min read | 06.24.25

CBP Issues First Comprehensive Guide to Modifying a Withhold Release Order (WRO)

On June 2, 2025, U.S. Customs and Border Protection (“CBP”) issued its first ever Withhold Release Order (“WRO”) and Finding Modifications Guide (“Guide” or “the Guide”). The Guide serves as a roadmap for importers facing a possible WRO or Finding due to allegations of forced labor in the supply chain of their goods imported into the U.S. It provides guidance on information to be included in a modification petition, identifies possible cases in which CBP might request additional information, and provides resources for importers facing a WRO or Finding....

View All Insights