Bar Admissions
- Arizona
Court Admissions
- Supreme Court of Arizona
- United States Court of Federal Claims
- United States District Court, District of Arizona
Education
- University of Illinois College of Law (J.D.)
- University of Illinois (B.A.)
vCard
Mitchell J. Klein
Of Counsel
Services
Biography
Mitchell Klein resolves complicated environmental disputes. His background as a prosecutor and government trial attorney gives him unique insight into the objectives and strategies employed by government regulators, and his creative approaches typically allow his clients to obtain beneficial resolutions to their problems without large transactional costs.
Mitchell’s reputation for honesty and fairness helps make governmental regulators and attorneys willing to work with him to explore creative solutions, and his reputation for an aggressive and dogged defense serves as the counterweight that helps his clients achieve their goals.
With 30 years of trial experience, Mitchell counsels clients in a wide variety of environmental and natural resource legal issues. He has extensive experience working with many state and federal agencies in all areas of natural resource and environmental law. Mitchell’s experience also includes litigation pursuant to the Clean Water Act, the Clean Air Act, Hazardous and Solid Waste regulations, and Superfund liability. He represents clients with administrative, permitting, and corporate compliance issues.
Prior to re-entering private practice, Mitchell was an assistant attorney general for the State of Arizona for nearly 10 years during which time he served as chief counsel for the Civil Unit of the Environmental Enforcement Section and was responsible for all environmental enforcement actions taken by the state. Mitchell is a judge pro tempore for the Maricopa County Superior Court.
Credentials
Experience
Awards & Recognition
- The Best Lawyers in America®
- Environmental Law (2019-2026)
- Natural Resources Law (2025-2026)
- Chambers USA: America’s Leading Lawyers for Business®, Environment (including water rights) (2014-2025)
- Arizona Business Magazine, Arizona’s Top Lawyers, Environmental Law (2013)
Representative Experience
Air Enforcement
- Represented food manufacturer in Oregon regarding $2,000,000 demand
- Represented Arizona utility regarding a potential criminal liability
Water Enforcement
- Represented Arizona mining company in connection with threatened shutdown
- Represented Indian facility with audit and self-reporting issues
Waste Enforcement
- Represented Arizona manufacturer regarding Resource Conservation and Recovery Act (RCRA) claims
CERCLA
- Represented national railroad in connection with contribution claims
- Represented California mining company in efforts to obtain contribution
- Represented various mining manufacturing and utility companies in Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) litigation in California, Arizona, New Mexico, and Colorado
Previous Professional Experience
- Polsinelli PC, Shareholder
- Bryan Cave, Counsel
- Jacoby and Meyers, Arizona Managing Partner
- State of Arizona, Assistant Attorney General
Professional Memberships and Activities
- Arizona State Bar Association
- Environment and Natural Resources Section, Past President
- Judge Pro Tempore, Maricopa County Superior Court
Community Involvement
- Keep Arizona Beautiful
- Board Member
- Vice Chairman
- Maricopa Parks and Trails Foundation
- Vice Chairman
- Arizona Strategic Alliance
- Advisory Board Member
Representative Presentations and Publications
- “Rule 4.2 Amended to Allow for Direct Government Communications,” Co-Author, Snell & Wilmer Legal Alert (February 28, 2025)
- “What Will EPA Do with Its New Superfund Money?,” Author, Snell & Wilmer Environmental, Natural Resources, Oil and Gas Law Blog (September 23, 2021)
- “The Rush is On for Jurisdictional Determinations,” Author, Snell & Wilmer Environmental, Natural Resources, Oil and Gas Law Blog (September 14, 2020)
- “Plaintiffs Seeking to Expand Scope of PFA’s Actions,” Author, S&W Environmental, Natural Resources, Oil and Gas Law Blog (February 26,2020)
- “Disposal Of Contamination: Be Careful What You Throw Away,” Author, Law360 (June 8, 2017)
- “Trump’s EPA: Be Careful What You Wish For,” Author, Law360 (January 19, 2017)
- “Defense Attorney Perspective,” Speaker, Western States Project, San Diego, California (September 2016)
- “Public Records Requests,” Speaker, Arizona Manufacturers Council, ESS 2016, Prescott, Arizona (August 2016)
- “The Defense Perspective,” Speaker, Western States Project, Mesa, Arizona (February 2016)
- “Responding to Environmental Enforcement Actions,” Speaker, Pinal County Air Quality, Florence, Arizona (January 2016)
Publications
Feb 27, 2025
Legal Alerts