Bonnie Trowbridge
Executive Director

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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 nonprofit development and fundraising, grant writing and management, and events management, and she spent 11 years in public relations and marketing 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 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; and work as a development director for nonprofits in Denver and Washington, D.C.  


Sonja Meintsma
Project Manager

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Sonja holds a Master of Public Affairs with a focus in sustainability and policy analysis from Indiana University’s O’Neill School of Public and Environmental Affairs (SPEA), as well as a Bachelor’s degree in Anthropology & African Studies from Macalester College in St. Paul, Minnesota—her home state. Sonja brings extensive community development experience to the team having worked as a grant coordinator for Girls Inc. of Monroe County (IN) and as a Peace Corps Volunteer in Zambia, where she focused on food security, income generation, and conservation agriculture. She has developed her knowledge and expertise on clean transportation and clean fuels through her work across the industry, having partnered with leading manufacturers, non-profits, and local governments to advance transportation electrification. She is dedicated to living sustainably and is motivated every day to fight for clean air and blue skies across Colorado.


Kristi Mladenovic
Business Manager

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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

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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

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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. Read an extended interview here. 


Steve Trowbridge
Project Manager, Fleets and Fuels

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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.


Julia Davila
Clean Cities University Intern

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Julia is a recent graduate from St. Olaf College in Northfield, MN and is originally from Fremont, CA. She holds a Bachelor’s degree in Environmental Studies with an emphasis in Social Science. During her college years, she served as the Sustainability Coordinator for non-profit Ole Thrift Shop, interned with the City of Palo Alto Utilities, and volunteered for the Sierra Club. She is excited to learn more about the sustainable transportation sector and how she can contribute to cleaner air in Colorado. In her free time, Julia enjoys hiking and spending time outdoors. Read an extended interview here. 


Selena Martinez
Clean Cities University Intern

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Selena is a recent graduate from the University of Colorado Boulder. She has a BS in Chemical Engineering with a Minor in Physics. During her time in college, she was involved in outreach volunteer programs for young girls to spark their interest in engineering and further diversify the field. She was also a peer advisor during her last year at CU and helped students plan their college career and prepare them for life after. In her free time, Selena loves to hike 14ers and spend time with her cat, Pinches.