Our Team

Meet our team of marketing strategists.

At GNA Creative, our innovation is inspired by our passion. We hire employees with a specific combination of qualities—integrity, imagination, and a constant drive to improve the world around them. Guided by these principals, we’ve attracted some pretty talented people with brand development and communications campaign strategy experience with internationally known brands—including PepsiCo, The Coca-Cola Company, American Honda, Los Angeles County Metropolitan Transportation Authority, Bay Area Rapid Transit, the California High Speed Rail, the Port of Los Angeles, Waste Management, Environmental Protection Agency, BNSF Railway, BMW, the City of Los Angeles, Frito Lay, NRDC, UPS, SoCalGas, the South Coast Air Quality Management District, and more.

Agency Management

Sarah Gallagher | Senior Vice President, GNA Creative

Sarah Gallagher has more than 15 years of experience developing communications and brand strategy campaigns for both small businesses and globally-recognized brands spanning the transportation, energy, and financial sectors. She manages a team of marketing specialists and graphic designers with extensive experience developing strategic communications and outreach plans to further clean air and transportation initiatives. Sarah holds a bachelor’s degree in business management from Capital University and a master’s degree in communications management from the University of Southern California. In 2014, Sarah started the annual “Women in Advanced Clean Tech” summit, which showcases the accomplishments of female executives shaping the future of the transportation sector. Sarah serves on the Communications Committee for NGVAmerica, and is a member of the Coalition for Clean Air, Heal the Bay, Young Professionals in Energy, and Women of Renewable Industries & Sustainable Energy.

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Strategic Communications

Celeste Griffy | Director, Strategic Communications

Celeste drives strategic communications projects for clients at the forefront advanced transportation, innovation, and clean tech. She develops creative strategies to build media coverage and promote industry-wide thought leadership by creating dynamic communication campaigns and messaging strategies for clients as well as for GNA’s executive team. Celeste leverages extensive experience in marketing, communications, and sustainability, having previously worked with clients across social and environmental issues to understand their audience, hone their message, and scale their reach. With a focus on sustainability, Celeste has created implementation and communication plans for businesses and organizations across sectors and industries globally. Celeste earned a bachelor’s degree from Loyola Marymount University and an MBA in Sustainable Management from Presidio Graduate School.

Barbara Brentano | Manager, Strategic Communications

Barbara Brentano collaborates with clients and stakeholders to develop and execute data-driven audience growth plans across all content distribution platforms. Barbara possesses a natural gift for engaging with clients and team members to build strong relationships. She is enthusiastic and passionate about the support of clients and stakeholders, whether it’s for live events including multi-day conferences, webinar participation, nurturing email campaigns, or marketing studies and surveys. She has lived abroad, including two years in Costa Rica where she served in the Peace Corps. She is a member of the Northeast Diesel Collaborative, the Nature Conservancy, and sits on the steering committee for the Working Harbor Committee in New York harbor.

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Engagement Marketing

Nicole (Nicki) Alcombright | Senior Manager, Engagement Marketing

Nicole manages the marketing, outreach, and partnerships for GNA’s events, including ACT Expo, Renewable Gas 360, and the California Dairy Sustainability Summit. She also provides project management for GNA’s digital media publication, ACT News, including the content calendar, webinars, and communications. She has eight years of digital marketing experience with a strong background in event marketing. Nicki obtained a BA from Loyola Marymount University and an MBA from Pepperdine University.

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Design & Development

Rodger Lueras | Art Director

Rodger Lueras leads the design and development of all visual aspects of a given marketing initiative to ensure the most engaging, consistent, and effective solution, including brand identity development, print and digital advertising, large scale event graphics, and websites. With over 20 years of industry experience, Rodger has delivered a diverse blend of talent and creativity while leading design projects for high-profile clients, including Mattel Inc., The Walt Disney Company, PepsiCo, and Nike.

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Anthony Antonopoulos | Senior Designer

Anthony Antonopoulos has spent more than 20 years designing and developing visually engaging graphics for the high-tech business sector. Anthony’s expertise includes print design, responsive email and web design and development, and video animation and editing. Over the past two decades he has worked with both small to mid-size businesses and global brands—including Apple, GE, Cisco, and Dell. Anthony holds a Bachelor of Science degree from the Art Institute of California and is a member of the American Institute of Graphic Arts (AIGA).

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Tim Decker | Lead Web Architect

Tim Decker conducts the creation and maintenance of all GNA Creative website projects. As a Full Stack Developer specializing in custom WordPress builds, Tim is galvanized by clean, efficient, and inspiring web production. Whether serving solutions for modest or booming companies, his ultimate goal is an administrative-friendly backend and intuitive, front-facing UI/UX. In addition, Tim places precise attention to site security and across—the-board performance and in doing so, openly embraces bleed-edge technology where suited in each new venture. He has a BA in Philosophy from Wheaton College.

Event Logistics

Tony Quist | Vice President, Sales & Events

Tony leads sales for GNA’s conferences and expositions, including the Advanced Clean Transportation (ACT) Expo and the Natural Gas for High Horsepower (HHP) Summit. He leverages more than 20 years of experience in the tradeshow industry to design events that return maximum value to participants. He oversees all aspects of event sponsor and exhibitor relations, including sponsorship package development, contract negotiations, and exhibit hall logistics and layout. Tony plays an integral role in building GNA’s event portfolio through new event launches and expansion of existing events.

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Kimberly Klonoski | Vice President, Event Logistics

Kimberly Klonoski oversees the management and execution of client-hosted workshops and ribbon-cuttings, as well as GNA’s conference series—including the Advanced Clean Transportation (ACT) Expo, Natural Gas for High Horsepower (HHP) Summit, Rethink Methane Symposium, and Dairy Sustainability Summit. She has more than 10 years of experience in the event and hospitality industries including contract negotiation, and the management of venue, hotel, audio/visual, and catering contracts. She is a professional with extensive logistics experience impacting the visibility, reputation and profitability of events through strategic planning and tactical details. Kimberly has a bachelor’s degree from Valdosta State University. She is a member of the Coalition for Clean Air and Young Professionals in Energy.

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Strategic Advisors

Erik Neandross | Chief Executive Officer

As one of the alternative fuel industry’s most knowledgeable, engaged, and trusted professionals, Erik has been at the forefront of some of nation’s largest alternative fuel vehicle projects–working with numerous Fortune 500 companies and public sector representatives. He has led the development of several of the nation’s most successful planned clean fuel corridors and is actively engaged in the high horsepower industry, including projects in the marine, rail, mining, and oil and gas E&P sectors. He was the visionary who launched two of the nation’s leading alternative fuel conferences – the ACT Expo and the HHP Summit. Outside of GNA, Erik contributes to a monthly column in Fleet Owner magazine, speaks at clean transportation events around the world, is on the board of the Coalition for Clean Air, Co-Chair of the City of Santa Monica Environmental Task Force, and a Director for the Zolla Family Foundation. Erik graduated Cum Laude from Colgate University.

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Cliff Gladstein

Cliff Gladstein | President

Since founding GNA in 1993, Cliff has been instrumental in the development of environmental programs and policies that have improved air quality, increased the use of clean fuels and advanced technologies in transportation, and spurred the creation of innovative public-private partnerships in a variety of sectors. It is for these reasons that he has become one of the most sought after leaders within the environmental and energy communities—he offers unparalleled experience, insight, and perspective on critical issues at the very heart of our transportation and energy systems.

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Sean Turner | Chief Operating Officer

Sean oversees GNA’s technical team and personally works directly on a host of engineering and advanced technology projects. He provides senior technical oversight to GNA’s clients on alternative fuel initiatives, air quality improvement, fleet planning, and vehicular technology. For more than 20 years, Sean has worked in international engineering consulting and government affairs on automotive emissions, alternative fuels, and air-quality issues.

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Learn more about our team of engineers, policy and compliance specialists, and grant writers who collaborate with us to develop the unique strategies that make GNA a recognized industry leader.

Full GNA Team