Sean is counsel in the strategic risk and crisis management practice based in Washington, D.C.

In 2025, Sean was named by Chambers and Partners as one of twenty notable AI practitioners globally.​ He has a deep understanding of the technology underlying many AI systems, applications, and products, and leverages that knowledge to offer cutting edge advice on how existing and contemplated laws will apply to AI. Sean advises on regulatory strategy and controversies in complex, highly regulated industries like the technology industry.  He has advised on product design, compliance, and commercial matters, especially related to artificial intelligence, internet platform services, content moderation, and big data. Sean’s practice is cross-disciplinary, focusing on both high-stakes investigations before federal agencies and in Congress, in addition to internal investigations and compliance counseling. 

Prior to joining Freshfields, Sean was investigative counsel for the US House of Representatives. There he gained experience managing cases as lead attorney investigating corruption-related allegations against members of Congress, including fraud, conflicts of interest, campaign finance issues, and violations of House ethics rules, FECA and FEC regulations, the LDA, STOCK Act, and criminal provisions of the US Code, among other federal and state laws.​

Earlier in his career, Sean was an associate at Williams & Connolly LLP, where he specialized in complex litigation and white-collar defense. He is now also an adjunct Professor at the Georgetown University Law Center teaching a seminar on ethics, professional responsibility, and career development.​