Colleen Whitaker
Sr. Program Associate

Tahnee is a professional facilitator, mediator and collaboration practitioner. For the past 20 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, youth engagement, coalition building, and overflight noise issues.  Previously, she was the associate director of the Program on Environment and Community at Cornell University and the Latin America coordinator for the Cornell International Institute for Food, Agriculture and Development. 

Tahnee has a Bachelor’s in Biology from Grinnell College and a Masters in Natural Resources from Cornell University. She is a member of the U.S. Institute for Environmental Conflict Resolution’s Roster of Environmental Conflict Resolution and Consensus Building Professionals. She is fluent in Spanish.  

Carrie Eberly​
Program Associate

Andi Rogers​
Sr. Program Associate

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. 

Who We Are

Colleen has worked in the area of community and environment for the past 10 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 both GIS and Natural Resource Management and is interested in how to create effective public participation opportunities that genuinely engage local communities in decision-making. 

Colleen has a bachelors 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.

Julia Sittig​
Program Associate

Julia has been facilitating collaborative processes for natural resource management in the Southwest for the past seven years.  She has supported the design, facilitation, and implementation of efforts concerning 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, and she continues to be involved in field-based research. Julia is passionate about designing forward-thinking, stakeholder-driven efforts that benefit both people and the land.

Abby Fullem 
Program Associate


Abby works on numerous complex issues including Landscape Conservation Design; watershed, outdoor recreation and other cross-jurisdictional place-based collaboratives; partnership building on public lands, environmental conflict resolution, youth engagement initiatives, network building, and program evaluation. Abby enjoys bringing diverse stakeholders together, creating systems for sharing experiences, information, and tools; and helping partners design practical and concrete strategies to efficiently move forward.

Abby has a Bachelor’s degree in Geology from Haverford College, where she conducted research on soil science, restoration practices and wildfire science. She also has experience in conservation and public lands management in Wyoming and thoroughly enjoys living, learning from and working with diverse people and communities in the Southwest.

Tahnee Robertson

working together to achieve innovative solutions​

Carrie has worked with local landowners, state and federal agencies and land-based stakeholders in a variety of positions related to natural resource collaboration in northern Arizona over the past 7 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.  Most recently she served as the program coordinator for the Diablo Trust, a ranch-based collaborative land management organization in northern Arizona.

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.