Practice Areas


Our attorneys have comprehensive experience in all aspects of environmental law.




We routinely advise on safety compliance issues, permitting, audit protocols and enforcement actions


We have decades of experience defending and trying toxic tort cases.



Our team has litigated a wide variety of environmental, corporate, product liability and commercial matters.

Upcoming Presentations

Michael S. McMahon, Gregory J. DeGulis, and Louis L. McMahon are among the speakers for the Cleveland Metropolitan Bar Association’s 2017 Environmental Law Institute on December 8, 2017. Lou will present on Green Infrastructure and Integrated Planning, Greg will be part of a panel discussion titled The Redevelopment of the Flats East Bank, and Mike will present Will Concern About Vapor Intrusion Take You to the Cleaners?

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McMahon DeGulis LLP ranked top in Ohio by Chambers USA

Chambers USA: America’s Leading Lawyers for Business (2017 Edition) recognized McMahon DeGulis LLP as a Band One firm in Natural Resources and Environmental law in Ohio.

Partners Michael McMahon, Gregory DeGulis, David Nash and Louis McMahon were also recognized for their individual representation of clients.

According to Chambers USA, McMahon DeGulis is a “highly regarded boutique with expertise covering the full range of environmental law. Possesses particular strength in wastewater and brownfield matters, as well as integrated planning work related to the CWA.”

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Wendlene Lavey Joins MD as Partner

Wendlene M. Lavey has joined McMahon DeGulis LLP as a Partner. Wendy arrives from Squire Patton Boggs and will continue her law practice focusing on environmental compliance, enforcement, permitting and related litigation and transaction support.

With over 25 years of experience in environmental and safety matters, Wendy’s current work includes major source permitting under the Clean Air Act, compliance and corrective action obligations under the Resource Conservation and Recovery Act, municipal wet weather issues under the Clean Water Act, and private party disputes regarding environmental contamination. She brings particular expertise on the steel, mining and chemicals industries. Read More.

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