Board of Trustees

Bobby Rolston, WNRF

President – Bobby Rolston, Cheyenne Wyoming

Bobby Rolston was born in Huntsville, Alabama and lived in Dallas, Texas for nearly 20 years. He graduated from high school in Dallas and then attended Texas A&M University in both College Station and Galveston, Texas where he earned a Bachelor of Science Degree in Marine Biology. Bobby then moved to Midland, Texas and earned a Master of Business Administration in Marketing from the University of Texas at the Permian Basin. Bobby has worked in the Oil and Gas industry since 1989 concentrating on State and Local Tax Policy in Colorado, Louisiana, New Mexico, Texas, Utah and Wyoming. In 2007 Bobby had the opportunity to move to the Rocky Mountain Region and finally settled in Cheyenne, Wyoming in 2015. Bobby is active in multiple trade associations including serving as Chairman of the Taxation Committee for The Petroleum Association of Wyoming, the Executive Committee of the Wyoming Taxpayers Association and the Executive Committee of the Utah Taxpayers Association. Bobby is a member of the Public Relations Committee at Cheyenne Frontier Days and serves as Chairman of the Fundraising Committee for CFD Western Art Show. Bobby’s personal interests include international travel to Italy and Mexico, fishing and golf. Bobby was also involved in Thoroughbred Racing as an owner and breeder of race horses. Bobby is married to his wife and high school sweetheart, Suzanne. They have been married for 36 years.

Vice President – Grant Stumbough, Casper, Wyoming

Grant is currently an associate district supervisor for the Natrona County Conservation District. He started his career in 1980 working for the Wyoming Department of Agriculture as a Natural Resource Program Coordinator and then later as the manager of the Policy and Natural Resource Division. He was also a natural resource advisor for Governor Geringer under the Governor’s Fellowship Program. In 2006, Grant accepted a position with the Natural Resource Conservation Service (NRCS) as a Resource Conservation and Development (RC&D) Coordinator and then later as the Public Outreach Officer. In 2017, he became the Public Outreach Officer for the Farm Service Agency (FSA), and then retired from the professional workforce in 2021. Grant is past president of the Wyoming Section of the Society for Range Management and past president of the National Society for Range Management Advisory Committee. He earned a Bachelor’s Degree in Agri-business from the University of Wyoming. Grant was born and raised on a cow/calf ranch near Wheatland and is married to Ronda and has one son, Garrett.

Jack Berger, Saratoga, Wyoming

Jack is the immediate past president of the Wyoming Natural Resource Foundation.  He also serves as a District supervisor for the Saratoga-Encampment-Rawlins Conservation District. He was appointed in 2004. He is active in the Carbon County Stock Growers and the Wyoming Stock Growers Association and was elected as Region IV Vice President in 2011. Berger is a member of the South Central Sage Grouse working group. Berger and his family reside in the Saratoga area and run a cow/calf operation. Berger earned a Bachelor of Science from the University of Wyoming in Ranch Management.

Brian Lovett, WNRF

Secretary – Brian Lovett, Cheyenne, Wyoming

Brian Lovett was elected to the Wyoming Association of Conservation Districts’ Board in 2012.  Lovett has been a supervisor on the Laramie County Conservation District since 2004.  He currently serves as Treasurer and is responsible for water quality and water quantity issues.  He serves on the Board of Directors for the Friday Food Bag Foundation in Cheyenne and is active in the Kiwanis Club of Cheyenne.  Brian is the Industrial Siting Administrator for the Wyoming Department of Environmental Quality.  He and his wife Kim live west of Cheyenne.

Sarah Hageman, Jay Em, Wyoming

Sarah was raised on a small family farm in Baggs, WY, where she built a passion for agriculture and the livestock industry. The industry led her to achieve her Bachelors’ degree in Agricultural Communications with a minor in Agroecology at the University of Wyoming. Having a deep interest in plant sciences, Sarah moved to Goshen County, where she fulfils the position of Assistant Supervisor at Goshen County Weed & Pest, serving landowners throughout the county with invasive pest population and land management practices. Sarah and her husband, Wyatt, live on his family’s sixth generation ranch west of Jay Em, WY. Allowing her to continue to grow with the agriculture industry and giving her firsthand knowledge of the importance, and struggles that come with land management. Sarah serves on several other boards within the Wyoming Weed & Pest Council, Goshen County and the Wyoming Mosquito Management Association.

Reg Phillips, Dubois, Wyoming

Reg has since 1981 has been Ranch Manager of the Diamond D Cattle Company, a cow/calf/yearling operation near Dubois Wyoming. Reg is a native of Arizona. He earned a BS in Animal Science from Kansas State where he also met his wife Aline.  Reg has been a supervisor on the Dubois-Crowheart Conservation District for over 25 years. He provided leadership to the Districts water quality monitoring program and also is a member of the founding group for the Dubois-Crowheart Weed Management Area to address noxious weeds.  Reg is a member of the Society for Range Management, Wyoming Section; past board member for the Wyoming Association of Conservation Districts, Wyoming Private Grazing Lands Team. He is a member of the Fremont County Cattleman’s Association; Wyoming Stock Growers and several civic organizations.

Casey Terrell, WNRF

Casey Terrell, Buffalo Wyoming

Casey is an attorney with the law firm of Crowley Fleck PLLP in Sheridan, Wyoming. Originally from Cora, Wyoming, Casey and his significant other Callie are new to the Sheridan area. He primarily practices in the areas of energy regulation and commercial litigation with a focus on natural resource issues, and is licensed to practice law in Wyoming, Montana, and North Dakota. Growing up in Sublette County in the shadow of the Wind River Mountains inspired Casey’s interest in natural resources from a young age. Casey graduated from the University of Wyoming with his Bachelors degree in Political Science, the Haub School of Environment and Natural Resources with his Masters degree in Environment and Natural Resources, and the University of Wyoming College of Law with his Juris Doctorate degree with honors. While completing these degrees he was selected as the Chiles and Evelyn Plummer Interdisciplinary Excellence Scholar, Clarence A. Brimmer Scholar, and Salt Creek Energy Excellence Scholar. During his second year of law school, he served as a research assistant for Professor Tara Righetti and continued to work with Professor Righetti as a Legal Research Fellow for the University of Wyoming CarbonSAFE grant funded by the DOE. He also served as an Article Editor for the Wyoming Law Review and represented the College of Law at various national moot court and negotiation competitions. He currently serves as President of the Sheridan and Johnson County Bar Association and Deputy Chief of Logistics for the Wyoming ENGAGE Council.


Dennis Thaler, LaGrange Wyoming

Dennis Thaler was raised on the family ranch in LaGrange, WY.  The ranch has been in the family for 102 years.  Dennis was a supervisor on South Goshen Conservation District for 30 years and on the WACD board for 8 years during which time the WNRF was formed.  Dennis is a past board member of the Goshen County Weed & Pest for 17 years and was involved in the formation of the Goshen County Weed Management Project, which was the first weed CRM in the state.  Dennis was in LEAD class 5, on the Wyoming private grazing lands team, Region II Vice President for the Wyoming Stock Growers Association in 2012 and 2013 and has served on many more boards.

Dan Zyvoloski, WNRF

Dan Zyvoloski, Bozeman Montana

Dan has been a Land Manager with Kroenke Ranches for over 12 years. His work focuses on energy development, real estate transactions, regulatory compliance, and enhancing the ranches natural resources. His diverse background is a result of helping successfully manage land assets covering over 2 million acres. Dan grew up in northern New Mexico and attended Montana State University where he obtained a degree in Land Reclamation. As an avid outdoorsman, he can be often found fly-fishing, bow hunting, or pursuing upland birds.


Nick Biltoft, Riverton Wyoming

Nick grew up in a small farming community in Nebraska. His high school years were spent working for the County Weed and Pest, the local CO-OP, and as a farm hand. He graduated from the University of Nebraska-Lincoln with a BS in Natural Resources in 1981. After graduation, Nick began his 34 year career with the Soil Conservation Service/Natural Resources Conservation Service, working in 4 field offices in Nebraska and retired in the fall of 2015 after 25 years as the District Conservationist of the Riverton Field Office. He was elected to the Lower Wind River Conservation District Board of Supervisors in 2018 and served as Chairman his first 4 years. He is past President of the Wyoming Chapter of the Soil and Water Conservation Society, past member of the Riverton Tree Board, and is a present member of the Governor’s Non-Point Source Task Force. He also works part time for a non- profit assisting Senior Citizens with Medicare fraud and billing issues. Nick and Cindy, his wife of 43 years, have three daughters and three grand children all in the Riverton area.


Jen Burr, Wheatland Wyoming

Jen’s bio coming soon.


David Tysdal, Newcastle Wyoming

David is the current Chairman of the Weston County Natural Resource District and has served on the board since 2015. David was raised as the seventh generation on a ranch near Newcastle, Wyoming. He, along with his wife Mandy, and son Davin, run a commercial cow/calf operation in addition to raising angus seedstock. David graduated from the University of Wyoming with a Bachelor of Science in Ag Business and a minor in Range Management. Prior to ranching full time, David worked for the US Forest Service and as an Ag Loan officer.


Andrea Sun-Zink, Casper Wyoming

Andrea Sun-Zink grew up on a ranch west of Casper. After graduating from the University of Wyoming in 2005 with degrees in economics and finance, she worked in the banking industry, mainly in commercial lending. In 2007 Andrea started working at the Wyoming Livestock Roundup, a weekly agriculture newspaper. While currently the General Manager of the Wyoming Livestock Roundup, she also works at her family’s ranch. Andrea and her husband Chris live in Casper.