About Rona

Rona focuses her practice on complex commercial disputes, including trade secret, antitrust, securities class action and general commercial litigation. She has represented a diverse range of clients – such as technology and life sciences companies, multinational corporations, and major financial institutions – in state and federal courts and in arbitrations. She also advises clients on investigations by government agencies.

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Admissions and credentials

  • New York

Experience

  • Cooley Defends Big League Advantage in High-Profile Dispute

    • Cooley Defends Big League Advantage in High-Profile Dispute

    December 2, 2025

    Cooley represents Big League Advantage (BLA), an investment firm that provides funding to minor league baseball players. If the players do not make it to Major League Baseball (MLB), they owe nothing; if they do make it, they owe BLA a percentage of their professional baseball earnings. BLA entered into a contract with then-minor league player Fernando Tatis Jr. After Tatis made it to MLB and ultimately signed a $360 million contract with the San Diego Padres, he ceased making payments to BLA. BLA prevailed in arbitration and moved to confirm the arbitral award, including attorneys’ fees, in the Superior Court of the District of Columbia. Seeking to avoid the award, Tatis subsequently brought claims against BLA in the Superior Court of California for the County of San Diego alleging the contract was invalid. Cooley is defending BLA in this matter as well.

    The Cooley team is led by Luke Cadigan and Mike Attanasio and includes Rona Proper and Amanda Jereige.

    Related contacts

    Luke Cadigan
    Partner in Charge – Boston, Boston
    Michael Attanasio
    Partner, San Diego
    Rona S. Proper
    Associate, New York
    Amanda Jereige
    Associate, San Diego

    Related Practices & Industries

    Sports+
    Commercial Litigation

  • Illumina Secures Motion to Dismiss Win in Federal Securities Class Action

    • Illumina Secures Motion to Dismiss Win in Federal Securities Class Action

    October 10, 2025

    Cooley secured a dismissal without prejudice for Illumina, a global leader in genetic and genomic analysis, in a securities fraud class action arising from the company’s attempted acquisition of GRAIL. The case is In re Illumina Inc. Securities Litigation before the US District Court for the Southern District of California (case number 3:23-cv-02082). Partners Koji Fukumura, Ryan Blair, Brian French and Heather Speers led the Cooley team representing Illumina.

    Read more

    Related contacts

    Koji Fukumura
    Partner, San Diego
    Ryan Blair
    Partner, San Diego
    Brian M. French
    Partner, New York
    Heather Speers
    Partner, San Diego
    Cristina Ferruolo
    Associate, San Diego
    Maggie Baruffi
    Associate, San Diego
    Rona S. Proper
    Associate, New York
    Sarah M. Egoul
    Associate, New York
    Linh Nguyen
    Associate, San Diego
    Julian Piroli
    Associate, San Diego
    Harris McLeod
    Associate, San Diego

    Related Practices & Industries

    Securities Litigation + Enforcement
    Class Action Litigation
    Commercial Litigation
    Life Sciences and Healthcare

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