Meet our Team
Founder and Director
Tahnee Robertson
Tahnee is a professional facilitator, mediator, and collaboration practitioner. For the past 25 years, in the U.S. and internationally, her project work has included forest planning and management, large landscape conservation, outdoor recreation planning, collaborative adaptive management, watershed management, community and regional visioning, and youth engagement. She specializes in designing and supporting place-based collaboratives and peer-to-peer networks.
Tahnee has a Bachelor’s in Biology from Grinnell College and a Master's in Natural Resources from Cornell University. She is fluent in Spanish.
Based in: Tucson AZ
Senior Program Associate
Colleen Whitaker
Colleen joined SDR in 2008 and has worked on community and environment issues for the past 15 years in the U.S., Britain, and Africa. Her project work has included community mapping and participatory GIS, youth engagement, environmental justice, regional visioning, and scenario planning. She has a background in GIS and Natural Resource Management and emphasizes creating effective public participation that genuinely engage local communities in decision-making.
Colleen has a bachelor's degree from the University of Arizona in International Development and Natural Resource Management, and an M.S. In Environment and Development from the London School of Economics.
Based in: Tucson AZ
Senior Program Associate
Andi Rogers
Andi is a wildlife biologist by training, whose career has primarily focused on natural resource conflict resolution. Before joining Southwest Decision Resources in 2013, she spent 15 years with the Arizona Game and Fish Department. During that period she served as the endangered California condor biologist, and the Habitat Specialist in Flagstaff, Arizona. Andi is well versed in a wide range of natural resource issues which include topics such as wind energy development, National Forest and BLM policies and directives, NEPA, ESA, transportation planning, forest and rangeland restoration, and grazing management on public lands.
Andi has a Bachelor’s degree in Zoology from the University of Montana and a Master’s degree in Wildlife Science from the University of Arizona.
Based in: Flagstaff AZ
Program Associate
Julia Sittig
Julia has been facilitating collaborative natural resource management efforts in the Southwest for the past seven years. She has supported the design, facilitation, and implementation of collaborative processes including large-landscape conservation, outdoor recreation, watershed-based collaboratives, inter-agency land use planning, and various other topics.
Julia has a Bachelor’s in Environmental Studies with a focus on Environmental Psychology from the University of Michigan, and an M.S. from the University of Arizona School of Natural Resources and the Environment. Her Master’s thesis focused on public perceptions of renewable energy facilities. Julia is passionate about designing forward-thinking, stakeholder-driven efforts that benefit both people and the land.
Based in: Tucson AZ
Program Associate
Carrie Eberly
Carrie joined SDR in 2015 and works with diverse stakeholders on natural resource issues including watershed planning and restoration, public lands recreation, water conservation, and volunteerism. In addition to collaboration work in Northern Arizona over the past 11 years, she has hands-on experience in community participatory analysis, curriculum development, and youth environmental education projects both locally and in South America as a Peace Corps volunteer and coordinator.
Carrie holds a B.S. in Environmental Biology from Pacific University and a M.S. in Environmental Science and Policy from Northern Arizona University. Her studies focused primarily on collaborative monitoring and results-focused stakeholder engagement. She is fluent in Spanish.
Based in: Flagstaff AZ
Program Associate
Jessica Olson
Jessica joined the SDR team in 2018 with over 12 years of experience in natural resource management and planning. Her science background and commitment to collaboration have shaped her work in the West. She has partnered with agencies, governments, and non-governmental organizations to accomplish forest and grassland restoration, regional planning efforts, policy development, and voluntary conservation programs. Along with SDR, she is concurrently part time senior planner for the country’s largest and most politically complex National Scenic Area in the Columbia River Gorge. She formerly served as Habitat Specialist for the Flagstaff Region at Arizona Game & Fish Department.
Jessica hold a B.S. in Ecology & Evolutionary Biology from The University of California, Santa Cruz and M.S. in Environmental Science & Policy from Northern Arizona University.
Based in: Phoenix AZ
Program Associate
Anna Murveit
Anna joined SDR in 2020, with five years of experience working on collaborative processes in California and across the western US. Anna is a trained facilitator with experience navigating conflict, guiding diverse coalitions, and bridging technical, political, and local actors. She assists partners in the water resources, energy, and environmental sectors through public processes, strategic planning, outreach, and communications efforts. She has organized and led public meetings, developed on-the-ground outreach strategies, designed and implemented task forces and workshops, engaged in regulatory rulemaking, and guided the works of long-term watershed collaboratives.
Anna is pursuing a PhD in Geography at the University of Arizona focused on collaborative water governance. She has an MS in Water, Society, and Policy at UA's School of Natural Resources and Environment. She earned a BA from Whitman College in Geology and Environmental Humanities.
Based in: Tucson AZ
Program Associate
Jessica Archibald
Jessica joined the team in 2022 after attending an SDR facilitation training the year prior. Jessica brings 7 years of experience in domestic and international social-ecological research, specializing in topics of restoration; water quality and access; food, energy, and water systems; and collaborative conservation. Her science background and dedication to inclusive processes have shaped her work in engaging diverse decision-makers, stakeholders, and volunteers in natural resource management and research. Jessica is passionate about facilitating science-driven and stakeholder-led initiatives that enhance social and environmental benefits.
Jessica holds dual bachelor’s degrees in Environmental Studies (B.S) and Spanish (B.A.) from Northern Arizona University. She is currently pursuing her doctoral degree in Earth Sciences and Environmental Studies from the same university. Her research centers on the social dimensions of mangrove management in Central America, with a particular focus on pathways towards collaborative management practices.
Based in: Flagstaff AZ
Program Associate
Mark Loseth
Mark joined SDR in 2022 after 20 years in the trails and outdoor recreation industry. His experience working for federal land agencies and a non-profit conservation corps has solidified his dedication to collaborative decision making to meet the needs of diverse communities throughout the Southwest. Mark is passionate about youth engagement, partnerships, outdoor recreation planning, and finding balance in solutions that benefit the largest audience. Through his work developing and leading trail skills trainings for a variety of non-profit organizations, Mark has learned the importance of practical learning to advance shared understanding of conservation objectives, and brings his perspectives to outdoor recreation projects in northern Arizona.
Mark has a B.A. in Geography from the University of Minnesota and professional certificate in GIS from San Francisco State University.
Based in: Flagstaff AZ
Administrative Associate
Lizzie Fistel
Lizzie joined SDR in 2022 after 7 years in restaurant management. She is organized and detail oriented with strong communication skills. She provides administrative support and project support to the SDR facilitation team.
Lizzie graduated from Guilford College in 2013 with a double major in Theatre Studies (Performance) and Justice and Policy Studies.
Based in: Tucson AZ