Practice Areas




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




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.

McMahon DeGulis LLP ranked top in Ohio by Chambers USA

Chambers USA: America’s Leading Lawyers for Business (2015 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.

The editorial observes that “Louis McMahon is an expert in matters pertaining to the CWA. One client notes: ‘Lou has been terrific in all areas of representation: he shows initiative, marshals resources to bring various parties together for important strategy sessions, knows key contacts within the water regulatory world and writes exceptionally well.’”

Learn More

Keely J. O’Bryan Named Partner

MD is pleased to announce that Keely J. O’Bryan has been named a Partner at the firm. Keely is based in the firm’s Cleveland office and represents clients across Ohio. She joined the firm in 2009.

A native of Cleveland, Keely has an active practice in both environmental litigation and counselling. She has broad experience in motion practice, fact investigation, depositions and expert preparation in complex environmental litigation. Keely currently represents an Ohio municipality in a multi-million dollar wastewater treatment plant litigation.

Learn More

Dave Bell and John Obery Join MD as Of Counsel

McMahon DeGulis LLP is pleased to announce that David L. Bell and John L. Obery of Dave Bell Law have joined the environmental and energy law firm as Of Counsel.

MD is pleased to add both Dave and John to the respected team of environmental, energy and litigation attorneys. Partner Greg DeGulis notes that “Dave Bell is a well-respected environmental lawyer who has extensive experience in all facets of the petroleum industry. Dave and John will be excellent resources for our expanding practice”. The firm is thrilled to have this additional experience which will benefit all clients.

As Of Counsel to the firm, Dave and John will continue operating Dave Bell Law, with a special focus on jointly developing and serving clients of both firms in a coordinated and cooperative manner.

Learn More



McMahon DeGulis LLP Team Banner