Roy represents businesses and public sector entities across a broad range of industry sectors in federal and state courts. He defends citizen suits and class actions involving toxic tort and product liability claims under federal environmental laws and state analogues, including the Resource Conservation and Recovery Act (RCRA), Safe Drinking Water Act, Clean Air Act, and Clean Water Act. He also represents clients in class actions and other consumer protection litigation involving green marketing and related allegations of greenwashing. 

Roy advises clients on issues relating to regulatory compliance. He represents clients in indemnity and other commercial contract disputes relating to construction as well as contaminated site cleanup under the federal Superfund law (CERCLA). Roy also works with clients to proactively manage sensitive multi-stakeholder interactions related to environmental justice, including developing creative solutions to address environmental justice community concerns. Additionally, Roy assists clients in navigating administrative regulatory proceedings under various environmental laws and advises them on mitigating the risks of regulatory enforcement actions and litigation. He currently serves in firm leadership as a Member of the firm’s Management Committee.

Roy prioritizes being an active member of his community. He joined the National Aquarium's Board of Directors in 2022 and is a member of the Aquarium’s Conservation Education Advisory Group, where he facilitates the creation of conservation education programming focused on urban and ocean conservation for students within Baltimore City and the surrounding areas. Roy is also a founding member and serves on the Advisory Board of the Black BigLaw Pipeline, Inc., a non-profit comprised of senior Black attorneys established to promote positive outcomes for Black attorneys working in large law firms. Beyond legal-related roles, Roy contributes to his community through youth mentorship as a Big Brother for Big Brothers Big Sisters and as a mentor for Bridges Baltimore.

Roy also maintains a commitment to pro bono service. The Philadelphia Court of Common Pleas' Pro Bono Honor Roll recognized Roy for assisting indigent and homeless clients in resolving contract disputes and obtaining public benefits. Roy received a Certificate of Appreciation from the Judges of the Eastern District of Pennsylvania for his service with the Prisoner Pro Se Civil Rights Panel where he represented a prisoner in a civil rights case. Roy also provides pro bono representation in various other areas of law, including unfair wage practice, immigration, and landlord/tenant matters.