Greg defends clients in litigation and government investigations involving complex financial products and counsels market participants on regulatory and compliance matters. As a Co-Chair of the firm’s Markets and Trading Practice, Greg works closely with the firm’s Investigation, Compliance, and Defense Practice on investigations conducted by financial regulators and the Department of Justice. His complex litigation experience includes defending market participants in securities fraud and market manipulation cases, including in multi-district litigation and other class actions. His other recent work includes leading the market conduct compliance team for the DOJ-appointed monitor of Glencore Ltd., the US branch of one of the world’s largest commodity trading companies, to evaluate the effectiveness of Glencore’s compliance with US commodities laws. According to client feedback in Chambers USA, "Greg offers both a sophisticated legal analysis and an easygoing manner that puts witnesses and regulators at ease."
Greg is deeply committed to pro bono work and non-profit leadership. As a past Director and President of the Chicago Bar Foundation, Greg works to bring together Chicago’s legal community to improve access to justice for those in need and to make the legal system fairer and more efficient for everyone. He also serves as a Director of the Institute for Global Affairs, which provides education on how the complexities of geopolitics impacts daily lives.
Greg serves on the firm’s Management and Pro Bono Committees.
I combine a deep understanding of client businesses with my sophisticated knowledge of the complex financial markets in which they compete. I help develop targeted legal strategies for addressing litigation and investigations arising from large market disruptions and market manipulation claims.
Representative Matters
- Leading the market conduct compliance team for the DOJ-appointed monitor of Glencore Ltd., the US branch of one of the world’s largest commodity trading and mining companies, who will evaluate the effectiveness of Glencore’s compliance with US commodities laws.
- Securing dismissal of all claims against securities and futures exchanges in multi-district putative class action litigation arising from allegations of manipulative trading in volatility-related derivatives.
- Leading the team representing Consolidated Audit Trail, LLC, a consortium of major securities self-regulatory organizations seeking intervention supporting the SEC in American Securities Ass’n v. United States Securities and Exchange Commission (No. 23-13396). The case, in the Eleventh Circuit, has implications for CAT’s ability to assess fees on other market participants.
- Guiding a significant securities market participant in matters arising from the January 2021 Robinhood/GameStop market events, including multi-district putative class action litigation.
- Representing commodities merchandiser in the successful resolution of DOJ and CFTC investigations regarding trading in grain markets.
- Representing the National Futures Association in a variety of matters, including in investigations and litigation related to the Peregrine Financial Group collapse following discovery that their founder had stolen more than $200 million in customer funds.
- Defending CME Group Inc. in multi-district class action litigation brought by commodity customers seeking $1.6 billion, and investigations arising out of the MF Global case.
- Representing the trustee of special purpose FCM and investment advisor Sentinel Management Group, including pursuit of claims against the securities brokers that sold Sentinel allegedly unsuitable investments.
Credentials
Service / Recognition
Overview
Greg defends clients in litigation and government investigations involving complex financial products and counsels market participants on regulatory and compliance matters. As a Co-Chair of the firm’s Markets and Trading Practice, Greg works closely with the firm’s Investigation, Compliance, and Defense Practice on investigations conducted by financial regulators and the Department of Justice. His complex litigation experience includes defending market participants in securities fraud and market manipulation cases, including in multi-district litigation and other class actions. His other recent work includes leading the market conduct compliance team for the DOJ-appointed monitor of Glencore Ltd., the US branch of one of the world’s largest commodity trading companies, to evaluate the effectiveness of Glencore’s compliance with US commodities laws. According to client feedback in Chambers USA, "Greg offers both a sophisticated legal analysis and an easygoing manner that puts witnesses and regulators at ease."
Greg is deeply committed to pro bono work and non-profit leadership. As a past Director and President of the Chicago Bar Foundation, Greg works to bring together Chicago’s legal community to improve access to justice for those in need and to make the legal system fairer and more efficient for everyone. He also serves as a Director of the Institute for Global Affairs, which provides education on how the complexities of geopolitics impacts daily lives.
Greg serves on the firm’s Management and Pro Bono Committees.
I combine a deep understanding of client businesses with my sophisticated knowledge of the complex financial markets in which they compete. I help develop targeted legal strategies for addressing litigation and investigations arising from large market disruptions and market manipulation claims.
Areas of Focus
Representative Matters
- Leading the market conduct compliance team for the DOJ-appointed monitor of Glencore Ltd., the US branch of one of the world’s largest commodity trading and mining companies, who will evaluate the effectiveness of Glencore’s compliance with US commodities laws.
- Securing dismissal of all claims against securities and futures exchanges in multi-district putative class action litigation arising from allegations of manipulative trading in volatility-related derivatives.
- Leading the team representing Consolidated Audit Trail, LLC, a consortium of major securities self-regulatory organizations seeking intervention supporting the SEC in American Securities Ass’n v. United States Securities and Exchange Commission (No. 23-13396). The case, in the Eleventh Circuit, has implications for CAT’s ability to assess fees on other market participants.
- Guiding a significant securities market participant in matters arising from the January 2021 Robinhood/GameStop market events, including multi-district putative class action litigation.
- Representing commodities merchandiser in the successful resolution of DOJ and CFTC investigations regarding trading in grain markets.
- Representing the National Futures Association in a variety of matters, including in investigations and litigation related to the Peregrine Financial Group collapse following discovery that their founder had stolen more than $200 million in customer funds.
- Defending CME Group Inc. in multi-district class action litigation brought by commodity customers seeking $1.6 billion, and investigations arising out of the MF Global case.
- Representing the trustee of special purpose FCM and investment advisor Sentinel Management Group, including pursuit of claims against the securities brokers that sold Sentinel allegedly unsuitable investments.
Credentials
Admissions
- Illinois, 1997
Education
- Harvard Law School, JD, cum laude, 1997
- Carleton College, BA, magna cum laude, Phi Beta Kappa, 1993
Court Admissions
- US Court of Appeals, Second Circuit, 2012
- US Court of Appeals, Seventh Circuit, 2006
- US Court of Appeals, Eleventh Circuit, 2024
- US District Court, Northern District of Illinois, 1997
- US District Court, Northern District of Illinois (Trial Bar), 2007
- US District Court, Eastern District of Michigan, 2002
Service / Recognition
Awards
- Chambers Global, Derivatives, 2022-2024; Derivatives: Enforcement, 2022-2024
- Chambers USA, Derivatives: 2021-2026; Derivatives: Enforcement, 2021-2026
- The Best Lawyers in America, Litigation - Regulatory Enforcement (SEC, Telecom, Energy), 2023-2026
- The BTI Class Action Leaders, 2026
- Illinois Super Lawyers, Rising Star in Professional Liability, Defense, 2010-2011
- American Bar Association, Section on Litigation, Outstanding Subcommittee Chair, 2011
Community
- Harvard Law Society of Illinois, Member, Board of Directors, 2024-present
- Eurasia Group Foundation, Member, Board of Directors, 2016-present
- Carleton College, Alumni Annual Fund and Reunion Planning Committee, Member, 2008-present
- Imagination, Chair, Board of Directors, 2011-2013; Member, Board of Directors, 2008-2011
Service to the Bar
- Chicago Bar Foundation, Immediate Past President 2023-2024; President 2022-2023; Vice President, 2020-2022; Board of Directors, 2014-Present; Chair, Advocacy Committee, 2014-2022; Member, Young Professionals Board, 2010-2013
- American Bar Association, Section on Litigation, Editor; PP&D, Pretrial Practice & Discovery Committee Newsletter, 2008-2013
- Illinois State Bar Association, Standing Committee on Professional Conduct, 2006-2008, 2010-2011