Who We Are - OSCAR Team

Susie Strife, Department Head

Susie leads the county’s Office of Sustainability, Climate Action & Resilience, providing direction on policies and program implementation for internal and external sustainability activities while managing planning efforts and budgets. She also serves as the key liaison to other county agencies to support existing projects and guide the county towards a more sustainable future. Susie received her PhD from the University of Colorado in 2009, and often teaches courses on sustainability, green design, and environmental sociology.

Tim Broderick, Senior Sustainability Strategist

Tim is responsible for the implementation and updating of Boulder County’s Zero Waste Action Plan and works on a regional and state level to help shape zero waste policy and planning. He is the county liaison to the Resource Conservation Advisory Board which advises the commissioners on major waste diversion policies and strategies. Tim partners with Boulder County’s Resource Conservation Division on county funded studies, reports, and grant research.

Deandra Croissant, Climate & Circularity Specialist

Deandra is on the Nature-based Climate Solutions and Circular Economy Team. Deandra leads urban landscape initiatives to improve resilience and mitigate climate impacts, investigates opportunities within carbon markets, and helps design and manage OSCAR’s circular economy programs to reduce supply chain emissions in the manufacturing sector. She also works on regenerative agriculture initiatives such as the Sustainable Food and Agriculture Fund. Deandra completed her Masters of Sustainability from the University of Sydney.

A portrait of Brett Fleishman

Brett Fleishman, Senior Climate Strategist

Brett manages OSCAR’s big-picture climate policy and strategy work. Driving projects, programs, and policies toward the scale and structure necessary to meet our climate and justice goals, Brett works with federal government agencies and regional partners to generate the needed resources and momentum. He has a background in climate finance, climate policy, organizing, and activism. Brett holds an MS in Development Economics from The New School.

Dave Hatchimonji, Residential Energy Efficiency Program Manager

Dave manages the residential EnergySmart service, which helps to make energy efficiency upgrades easier and more affordable for county residents, including designing and monitoring incentives and new financing products. Dave also serves as liaison to Xcel Energy and the Public Utilities Commission on energy efficiency issues and assists in the administration of the energy loan product. He began his tenure with Boulder County at Longs Peak Energy Conservation prior to coming to the OSCAR.

Portrait of Christian Herrmann

Christian Herrmann, Climate Communications Specialist

Christian leads strategic communications to create awareness and inspire action around climate change and OSCAR initiatives. He is responsible for department branding, media relations, and social media campaigns. His video and digital media work has focused on sustainability, social justice, education, and the arts with a particular emphasis on subjects from traditionally marginalized and LGBTQ+ communities. Christian completed his BA in Social Anthropology at Cambridge University.

Portrait of Marina La Grave

Marina La Grave, Climate Equity Specialist

Marina leads OSCAR’s intercultural communications, engagement, and language access initiatives. She works across departments and within the community to advance equity, strengthen collaboration on race and justice, and deepen relationships with the county’s most climate-vulnerable groups. By analyzing climate and sustainability initiatives through an equity lens, Marina supports decision-making processes and prioritized actions across the department. Marina is a United Nations translator and interpreter with over 30 years of experience.

Photo portrait of Collin Tomb.

Collin Tomb, Climate & Health Strategist

Collin reaches across county lines to address the common sources of air pollution and greenhouse gases through state-level programs and policy, working closely with Public Health and the Policy Office. She brings health, science and equity expertise to the policy process through government and professional collaborations. Collin has a background in bioscience, green building, business sustainability and air quality. She holds a BA in Biology from Harvard University and an M.Arch. from the University of Utah.

Lea Yancey, Community Sustainability & Electric Vehicle Specialist

Lea fosters partnerships with communities and organizations throughout Boulder County around a vision for sustainability. Her work encourages collaboration through partnership to achieve mutual goals, share knowledge, and leverage resources. Lea also leads countywide transportation electrification initiatives to accelerate the adoption of electric vehicles, electric bikes, and associated charging to reduce carbon emissions and improve air quality.