Bonnie Trowbridge

Executive Director


Bonnie brings a deep knowledge of the market – from consumer EVs to alternative fuels to heavy-duty manufacturers and fleets, and a comprehensive understanding of the vehicle incentives arena across the U.S. – to her role as Executive Director for the Denver Metro Clean Cities Coalition. With over 25 years of experience in business development for nonprofits and corporations, Bonnie is focused on achieving breathable air for everyone by advancing the clean transportation industry. Her past experience includes marketing and communications for Lightning Systems, manufacturer of electric powertrains for medium- and heavy-duty buses and trucks, where she was instrumental in growing that company from a start-up to a thriving manufacturer. Her other experience includes program management for CALSTART, a non-profit organization working to commercialize clean and efficient transportation solutions, where she led events such as a California policy summit, industry leader workshops, and utility engagement programs.

Kristi Mladenovic
Business Manager


Kristi  is the Finance & Administration Manager at Denver Metro Clean Cities Coalition. Kristi provides leadership in all areas of accounting and is responsible for administrative systems and data. She has over 20 years of experience in various senior accounting and financial analysis roles, directing the full spectrum of accounting and financial services from a $6B international firm to a diverse group of nonprofit organizations. She currently serves as a board president, vice president and treasurer for three local nonprofits. She is a 2nd Degree and Certified Instructor at a world-renowned Tang Soo Do martial arts academy. She received her Bachelor’s degree from The George Washington University.

Claciann Oliva
Project Manager


Claciann has 28 years of sales and marketing management experience in the automotive, financial, and advertising industries. She has been very active in her children’s school serving on School Accountability Committee, Finance Committee, 5B Building Committee and chairing a high school feasibility study for potential future growth. Claciann has studied Political Science both domestically and internationally.

Gabriella Perkins
Program Manager


Gabriella Perkins joined Denver Metro Clean Cities in March of 2020 as the Program Manager, focusing on outreach and events. Gabriella has a BA in Communications Studies with a minor in Political Communication from Colorado State University. Prior to joining DMCC, Gabriella worked at Lightning Systems as a Marketing Coordinator and a Grant & Incentive programs analyst. Her experience in clean transportation has fostered a dedication to work towards cleaner air in the Denver Metro Area.

Steve Trowbridge
Project Manager, Fleets and Fuels


Steve Trowbridge is Coordinator of Denver Metro Clean Cities Coalition. With experience in almost every facet of the transportation industry, Steve has a unique insight into the clean fuels and advanced technology aspect. He spent 15 years with the Colorado Department of Transportation (CDOT), starting as a snowplow driver and finishing as an eminent domain appraiser, even testifying as an expert witness on several occasions. Steve holds a Class A Driver’s License with endorsements for Hazmat, Doubles/Triples and Tankers with experience operating, maintaining and repairing medium and heavy-duty commercial vehicles. As an integral part of a team representing the testing and development of hybrid trucks and buses, Steve consulted and coordinated with both engineers and mechanics to create maintenance plans, fleet analysis and training for advanced energy fleets. As Steve’s transportation career evolved, he became more aware of the industry impact on the air quality in Colorado and he developed a passion for finding solutions for cleaner air.

Steve graduated Cum Laude from Regis University with a Bachelor of Science in Business Administration.