Derrick A. Denis, a Senior Vice President with Clark Seif Clark, Inc. (CSC) and is an internationally recognized environmental health and safety (EH&S) expert. CSC is a full-service industrial hygiene (IH) and environmental testing/consulting company with locations in Arizona and multiple locations in California. CCS has extensive expertise working across the country in anticipation, recognition, evaluation, and control of hazards in indoor and outdoor environments. They are also specialists in wildland-urban-interface fires and lithium-ion battery fires (EVs, mobility devices etc.).

Mr. Denis is a practitioner, inventor, educator, author and volunteer, who has provided professional industrial hygiene (IH), environmental health and safety (EH&S), infection control (IC), and indoor environmental quality (IEQ) services domestically and abroad for over 32 years. He is also a renowned impartial expert in insurance and litigation disputes (composing declarations, providing depositions, and testifying in trials, etc.) for both plaintiffs and defendants. In addition Mr. Denis is a sought-after presenter and instructor, who has provided hundreds of educational sessions for associations around the world.