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Ryan Russell Kemper


St. Louis
314 552 6321 314 552 6321 direct

Ryan has a broad and diverse practice serving clients navigating sophisticated matters related to air, water, land, energy, agriculture, emergency response and climate issues. He serves as co-chair of Thompson Coburn's Environmental Law group and has successfully handled cases across the country under the full spectrum of federal, state, and local environmental laws and regulations.

Ryan serves as lead counsel for clients in multiparty complex litigation, defends civil and criminal enforcement, handles government investigations, leads permitting actions and negotiations, litigates administrative actions, and counsels clients on a wide array of regulatory compliance matters. Ryan has also responded to releases, accidents, spills and other incidents to provide on-the-ground practical advice and crisis strategy assistance to clients handling emergency situations.

Ryan has over a decade and a half of litigation experience from case initiation through final resolution, including trial, with an emphasis on environmental, agriculture, products liability, and property cases. Ryan currently serves as lead counsel for clients in multiple high-profile Superfund cases. He also has extensive experience handling expert discovery and developing technical evidence.

Ryan's regulatory and counseling work for clients covers a wide spectrum of environmental issues including matters under the Clean Air Act (CAA), the Clean Water Act (CWA), Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), the Resource Conservation Recovery Act (RCRA), the Emergency Planning and Community Right-To-Know Act (EPCRA), the Toxic Substances Control Act (TSCA), and the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).

Ryan also counsels clients on climate, ESG, and environmental justice issues. Ryan has handled significant air and climate issues for over fifteen years and has advised clients with regard to carbon sequestration, GHG reporting and accounting, and the environmental aspects of government incentive programs for carbon offsets and credits, including clients in the energy sector. He also has substantial experience with major source permitting and mobile source emission rules. He also has helped clients evaluate ESG issues and assisted clients with community outreach in permitting and other projects.

Ryan believes strongly in volunteerism and community service. Ryan is a board member of the United Way of Greater St. Louis and is the Chair of the Board's Public Policy Committee. He also serves as a Planning Commissioner for the City of O'Fallon, Illinois, and is a board member of the St. Clair County Special Emergency Services Association, a non-profit that assists first responders with highly specialized expertise and technical equipment (HAZMAT Response, Technical Rescue Response, K-9 Search and RMERT) during times of crisis. Ryan was named to the St. Louis Business Journal's "40 under 40" class in 2017 and is an alum of Leadership St. Louis.

Thompson Coburn Publications

EPA Makes Major Moves on PFAS in April

California's New Environmental Disclosure Laws Mandate Corporate Transparency

EPA incorporates environmental justice into enforcement policy: How can regulated industries prepare?

SEC emphasizes ESG by establishing new website and taking public comments on climate disclosure

New administration, new priorities: Preparing for the Biden-Harris Administration’s key environmental focus areas

EPA Final Rule may keep projects at existing major sources from triggering stringent pre-construction permitting requirements

What to do when the government comes calling: A checklist for handling facility inspections

Environmental deregulation under President Trump: Business as usual?

Supreme Court overturns EPA’s 'Tailoring Rule,' upholds GHG BACT for 'anyway' sources


Ryan R. Kemper, Note,
Responding to Bioterrorism: An Analysis of Titles I & II of the Public Health Security and Bioterrorism Preparedness and Response Act of 2002, 83 Washington University Law Quarterly 385, 2005


“Environmental Enforcement in Transition” (Panel Discussion);
REGFORM Biden Administration Transition Seminar, Virtual Conference, March 2021 March 2021

“EPA’s New Plan Under Trump”;
Mid-America Croplife Association, St. Louis, MO, June 2018

“Assessing Environmental Risk and Liability When Acquiring Real Estate”;
The Metropolitan St. Louis Sewer District, St. Louis, MO, September 2016

“Waters of the United States”;
CPS Short Course 2015: Sharing the Vision, Loveland, CO, April 2015

"President Obama's Second Term & Energy Agenda";
Gateway Society of Hazardous Materials Managers Spring Seminar, St. Louis, MO, April 2013

"The Client Consultant-Attorney Relationship: Making it Work from Start to Finish";
Crop Production Services' Technology Share Conference, Loveland, CO, May 2012

"Accident Investigations: Collecting High Quality Information the Right Way";
Crop Production Services' EH&S Fall Staff Meeting, Providence, RI, September 2011

"Environmental Reports and Consultant Communications: Tips from a Legal Perspective";
Crop Production Services' Technology Share Conference, Loveland, CO, March 2011

"Environmental Law 101: Just the 'Acts'";
Missouri Chamber of Commerce and Industry Environmental Conference at the Lake, Osage Beach, MO July 2010

"President Obama's Green Team and the Administration's Environment and Energy Agenda: One Year Later";
Gateway Society of Hazardous Materials Managers Spring Seminar, St. Louis, MO, April 2010

"Pending Federal Carbon Cap and Trade Legislation- H.R. 2454: The American Clean Energy and Security Act";
Leadership Council of Southwestern Illinois Board Meeting, Collinsville, IL, October 2009

"The New Administration: What to Expect from President Obama's Green Team";
Chemical Industry Council of Illinois Seminar: The Musical Chairs Surrounding Air Issues and the New Administration, Willowbrook, IL, March 2009

"USEPA RCRA Enforcement Issues";
Chemical Industry Council of Illinois RCRA Seminar, Fairview Heights, IL, January 2009


Thompson Coburn Attorneys Recognized in Chambers USA 2024

Ryan Russell Kemper and Paul Sonderegger Named to Environmental & Energy Law Power List

Chambers USA Recognizes Thompson Coburn Practices for Excellence in 2023 Guide

Thompson Coburn’s Environmental practice group celebrates top rankings

Ryan Russell Kemper selected for Leadership St. Louis

Ryan Russell Kemper named to St. Louis Business Journal’s 40 Under 40 list

Ryan Russell Kemper to head United Way fundraising effort

Congratulations to the new Thompson Coburn partners for 2014

Ryan Kemper, Thompson Coburn environmental practice featured in St. Louis Lawyer

More than 50 attorneys named to 2012 Missouri Bar Pro Bono Hall of Fame