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We assist clients through a combination of consulting support, technology-based solutions, professional training, and staffing services.

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Jim Lyons

on September 1, 2026

Jim Lyons is Director of Trinity Consultants’ Mobile Source and Fuels Services business line and is based in the Phoenix, Arizona office. He brings over 40 years of experience in the development, implementation, and evaluation of mobile source emissions and fuel regulatory programs at both the state and federal levels.

As leader of Trinity’s Mobile Source and Fuels team, Mr. Lyons oversees technical services related to new engine and vehicle certification, low-emission fuel strategies, and advanced control technologies. His expertise includes the Low Carbon Fuel Standard (LCFS), Renewable Fuel Standard (RFS), evaporative and refueling emissions, and greenhouse gas compliance programs. He routinely evaluates the emission impacts, costs, and cost-effectiveness of control measures across light- and heavy-duty, on-road and nonroad sources.

Mr. Lyons is nationally recognized as an authority on mobile source regulations and serves as a testifying and consulting expert in litigation involving product liability, intellectual property, and regulatory compliance. He has supported high-profile enforcement cases in the auto manufacturing and refining sectors, including international expert testimony in China.

He has authored or contributed to more than 100 technical reports and peer-reviewed publications on emissions modeling, fuel impacts, vehicle standards, and air quality strategy.

He holds an M.S. in Chemical Engineering from the University of California, Los Angeles, and a B.S. in Chemistry (Cum Laude) from the University of California, Irvine. He is a member of the Society of Automotive Engineers.

Jay Hofmann

on September 1, 2026

Jay Hofmann is a member of the Trinity Consultants Board of Directors and Divisional President, Environmental Consulting. A 30-year+ veteran of the firm, he has served in several key roles at Trinity. The firm’s initial focus was on air quality consulting, with niche expertise on the complex permitting process for large, industrial facilities. Over the past two decades, Trinity has expanded from an air quality consulting firm into a multi-media environmental consulting, water and ecology, built environment, and life sciences company.

Jay joined Trinity as an environmental consultant in 1986. He later served as Chief Operating Officer and in 2001 was named President and CEO. In 2023, he stepped down as President and CEO while continuing to remain active in the business.

He has substantial consulting experience and is a recognized authority on Clean Air Act (CAA) regulations, air pollution (source) impact assessments, air pollution control technologies, and environmental management systems. He has also conducted process development work associated with air pollution controls used in oil refining operations and conducted research of the formation of acid rain. His consulting focus is CAA compliance and training. He has routinely been called upon to train environmental professionals and to formally evaluate prospective capital projects involving upgrades and implementation of new and more efficient process in a variety of ways. He has developed and taught numerous private and customized CAA classes to major industrial companies.

He is a member of the Board of Directors of the Council of Industrial Boiler Owners (CIBO) and he has been active on CIBO’s Environmental Committee since 1994. CIBO works closely with the EPA, the United States Department of Energy, state regulatory authorities, and other governmental bodies to effectuate common-sense environmental regulation.

Jay earned B.S. and M.S. degrees in Chemical Engineering from the Massachusetts Institute of Technology (MIT). He also received an M.S. degree in Atmospheric Sciences from the University of Arizona and has completed executive business training at Dartmouth’s Tuck Executive Program.