William Underwood

Environmental Law

4.0 (1 reviews)

Phoenix, Arizona

28+ years experience

Gallagher & Kennedy PA

Updated: Jan 02, 2026

Contact Information

(602) 530-8125

https://gknet.com/attorneys/williamunderwood/

2575 East Camelback Road, Suite 1100, Phoenix, AZ 85016

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Bio

With more than twenty years of experience in federal, state, and local air quality laws and in representing clients across the U.S. from a variety of industries, Bill is uniquely skilled at providing effective counsel and working toward solutions that best serve his client’s specific needs. Bill is dedicated to helping clients understand their compliance obligations under the myriad of air quality programs, regulations, and agency guidance so that such obligations can be managed as effectively and efficiently as possible. Given the multi-disciplinary nature of air quality matters, Bill often serves as a catalyst for creating a team approach to problem solving by working closely with management, technical and operational personnel, consultants, and regulators to achieve favorable results for his clients. With more than twenty years of experience in federal, state, and local air quality laws and in representing clients across the U.S. from a variety of industries, Bill is uniquely skilled at providing effective counsel and working toward solutions that best serve his client’s specific needs. Bill is dedicated to helping clients understand their compliance obligations under the myriad of air quality programs, regulations, and agency guidance so that such obligations can be managed as effectively and efficiently as possible. Given the multi-disciplinary nature of air quality matters, Bill often serves as a catalyst for creating a team approach to problem solving by working closely with management, technical and operational personnel, consultants, and regulators to achieve favorable results for his clients.

Practice Areas

Environmental Law

Awards & Recognition

Recognized: Environmental Law
Recognized: Natural Resources Law
Special Focus: Air Quality

Recognized in Best Lawyers since 2023

Education

Indiana University Bloomington, J.D., graduated 1997
Arizona State University, M.B.A., graduated 1994
University of Nevada, B.S., graduated 1991

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Reviews

Matthew Williams

2 weeks ago

Expert guidance on complex air quality compliance

Bill Underwood at Gallagher & Kennedy provided exceptional counsel for our manufacturing facility's Title V permitting process. His deep knowledge of federal and state air quality regulations, honed over 28 years, was immediately apparent. He efficiently navigated the complexities with the state agency, referencing precedents we hadn't considered. His dual J.D. and M.B.A. background was invaluable, blending legal strategy with practical business impact. While his expertise is worth the investment, communication during less critical phases could be slightly more prompt. His recognition in environmental and natural resources law is well-deserved. We feel confident with him as our counsel.