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, urban planning, watershed collaboratives, collaborative adaptive management, community 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
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Senior Facilitator
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 in International Development and Natural Resource Management from the University of Arizona, and a Masters in Environment and Development from the London School of Economics.
Based in: Tucson AZ
Senior Facilitator
Andi Rogers
Andi joined SDR in 2013 after a 15 year career working in wildlife biology. Before joining Southwest Decision Resources, she focused primarily on wildlife-related research, endangered species recovery, and environmental policy. As a facilitator and mediator working with SDR, her career primarily focuses on convening diverse and inclusive partners, in order to engage in productive dialogue surrounding complex natural resources issues. In addition, Andi has a particular interest in, and experience with, navigating conflict at multiple levels (1 on 1, team dynamics, multiparty). Her approach to conflict resolution focuses on normalizing, addressing directly and honestly, holding safe space for meaningful contributions, and adding light-hearted energy (when appropriate) to tense times.
Andi also has a strong interest and experience with environmental education and serves as a board member for a local Environmental Education center in Flagstaff, AZ.
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
Senior Facilitator
Brian Manwaring
Brian joined SDR in 2024 with more than 25 years of experience helping groups and organizations learn, collaborate, solve problems, and navigate change successfully. As a facilitator and mediator, he specializes in complex, multiparty environmental collaborative processes, applying a tailored, adaptive, and inclusive approach to ensure that the needs and substantive interests of all parties are appropriately addressed. He has worked on a range of environmental issues, including water resource management, ecosystem recovery and restoration, public lands management, ocean and coastal planning, climate change, infrastructure planning, and species protection.
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Prior to joining SDR, Brian spent 16 years in Federal service, most recently serving as the Director of the Udall Foundation’s John S. McCain III National Center for Environmental Conflict Resolution. He holds a Master’s degree in Conflict Resolution with a focus on environmental policy from the University of Denver and a Bachelor’s degree in Management Science from Virginia Tech.
Based in: Tucson AZ
Senior Facilitator
Julia Guglielmo
Julia joined the SDR team in 2013. She has supported collaborative natural resource management in the Southwest through the design, facilitation, and implementation of collaborative large-landscape conservation, outdoor recreation, wildlife habitat, rangeland management, watershed land use planning, as well as strategic planning, and community visioning efforts. Julia is committed to helping partners find forward-thinking, actionable solutions that serve both the land and communities.
Julia has a Bachelor’s in Environmental Studies with a focus on Environmental Psychology from the University of Michigan, and a Masters in Natural Resource Management from the University of Arizona. Her graduate studies focused on environmental impacts and public perceptions of renewable energy facilities.
Based in: Tucson AZ
Senior Facilitator
Carrie Eberly
Carrie joined SDR in 2015 and works with diverse partners on natural resource issues including forest planning and landscape restoration, public lands recreation; she also works on robust community engagement with local municipalities on issues related to parks, housing, local economics and the environment. In addition to collaboration work in Northern Arizona over the past 15 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 has a Bachelor’s in Environmental Biology from Pacific University and a Masters 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
Senior Facilitator
Jessica Olson
Jessica joined the SDR team in 2018 with a background in natural resource management and planning. She has worked in Arizona, California, Oregon, and Washington 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 Columbia River Gorge National Scenic Area where she led the development of the first gorge wide Climate Change Action Plan. Her past work includes 9 years with the Arizona Game & Fish Department in Flagstaff.
Jessica has a Bachelor’s in Ecology & Evolutionary Biology from the University of California, Santa Cruz and a Masters in Environmental Science & Policy from Northern Arizona University.
Based in: Phoenix AZ
Facilitator
Lisa Clark
Lisa joined the SDR team in 2019 and has supported collaborative natural resource management efforts including watershed partnerships, multi-jurisdictional outdoor recreation planning, collaborative governance, and strategic planning. She brings diverse experience with collaborative river restoration, ecological research, volunteer stewardship, outdoor education, and non-profit development and management.
Lisa has a Bachelor’s in Environmental Studies with a focus on The Southwest Environment from Northern Arizona University and a Masters in Biology from University of Denver. Her graduate studies focused on the impacts of collaboration on river restoration efforts in the Southwest.
Based in: Flagstaff AZ
Facilitator
Anna Murveit
Anna joined SDR in 2020. Her work with SDR specializes in multi-stakeholder convening, strategic planning, stakeholder engagement, and long term watershed collaboration – especially related to western water, public policy, and climate adaptation. Previously, Anna worked as a policy and management consultant at CEA Consulting. In this role, she worked with national-level environmental NGOs and a Fortune 500 energy company on policy research, political advocacy, and regulatory strategy. She also managed communications and outreach for the Klamath River Renewal Corporation, the NGO responsible for implementing the largest dam removal project on Earth, so far. Anna also serves as a volunteer mediator for the Arizona Attorney General’s Office, Civil Rights Division.
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Anna has a Bachelor’s in Geology and Environmental Humanities from Whitman College and a Masters in Water, Society, and Policy from the University of Arizona. Her graduate research focused on technology and stakeholder engagement on the Colorado River. She is proficient in conversational Spanish.
Based in: Tucson AZ
Facilitator
Jessica Archibald
Jessica joined the team in 2022 after attending an SDR facilitation training the year prior. She 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.
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Jessica holds dual Bachelor’s 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. She is fluent in Spanish.
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Based in: Flagstaff AZ
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Facilitator
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. He 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 Bachelor’s in Geography from the University of Minnesota and professional certificate in GIS from San Francisco State University.
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Based in: Flagstaff AZ
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Facilitator
Annia Quiroz
Annia joined SDR at the end of 2022, after four years of managing and facilitating collaborative programs, digital communications, and partner stewardship and empowerment. She has also managed habitat enhancement projects, large-landscape conservation initiatives, and environmental education programs. She has an interest in interdisciplinary collaboration, all things communication, and the intersection between conservation and agriculture.
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Annia has a Bachelor’s in Journalism from the Cronkite School at Arizona State University, and a Master’s in Environmental Mass Communication from University of Colorado in Boulder.
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Based remotely
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Facilitator
Nell Smith
Nell joined the SDR team in 2023 with a background in field biology, environmental and outdoor education, creative writing, and science communication. This interdisciplinary experience shapes her approach to engaging diverse decision-makers, community leaders, and volunteers on issues and opportunities that matter. Nell has supported natural resource management efforts including ecological monitoring, wildlife and habitat restoration, public land conservation, socio-ecological research, collaborative watershed planning, inclusive science communication, community outreach, and informal STEM education. She is committed to creating equitable collaborative processes that build strong partnerships and engage local communities in decision-making.
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Nell has a Bachelor’s in Conservation Biology and Arts & Letters from Prescott College and a Master of Fine Arts in Creative Writing and Environment & Natural Resources from the University of Wyoming
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Based in Phoenix, AZ
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Junior Facilitator
Ruby Kernkamp
Ruby joined the SDR team in 2024 with expertise in groundwater reform, stakeholder engagement, and collaborative governance in the arid West. Her interdisciplinary background informs her facilitative approach, fostering collaborative decision-making on natural resource, community, and public policy issues to create enduring solutions. Before joining SDR, Ruby worked as a consultant and researcher, addressing complex water governance challenges across multiple scales and sectors. She is committed to creating inclusive, community-centered pathways that promote equitable and sustainable resource management.
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Ruby holds a Master’s in Water Science, Policy, and Management from the University of Oxford and a Bachelor’s in Anthropology from Columbia University.
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Based in Tucson, AZ
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