Ryan has a diverse environmental practice that includes representing companies in complex environmental litigation, government enforcement actions, and CERCLA cost recovery and contribution cases. He represents clients in state and federal courts and before environmental agencies in Illinois and across the United States.

He regularly counsels companies on compliance with state and federal environmental laws and regulations, assists clients with internal investigations, and provides guidance on responding to information requests. Ryan has worked extensively for clients in the manufacturing, waste, recycling, and environmental services industries.