Mary Peyton assists clients with issues involving air, water, and natural resources, helping them anticipate risks and address regulatory demands efficiently. She is particularly attuned to the intersection of environmental regulation and business operations, offering practical strategies that support both compliance and long-term objectives.

Her experience prior to joining Barnes & Thornburg includes legal externships and fellowships with the North Carolina Department of Justice, the Southern Environmental Law Center, the Natural Resources Defense Council, and the Environmental Working Group. These roles gave her exposure to a wide spectrum of environmental matters, from clean air initiatives to energy regulation, which now informs her practice in advising clients across industries.