Superintendent's Office

Barclay Trimble, Acting Superintendent

Barclay Trimble, Acting Superintendent

Barclay Trimble assumed duties as the acting superintendent of Yellowstone National Park in October 2026.

Barclay has served in a variety of leadership positions throughout his 35-year National Park Service career. Prior to Yellowstone, he served as the superintendent of Mammoth Cave National Park and acting deputy regional director and acting director of business services for the Southeast Region. In the latter two roles, he oversaw park units across Alabama, Georgia, Kentucky, Mississippi, North Carolina, and South Carolina, and directed the region's budget, administration and commercial services programs. He also served as liaison for the consolidated contracting and information technology programs.

At Mammoth Cave, Barclay focused on enhancing visitor experiences while protecting the park’s globally significant cave, karst and surface resources. Under his leadership, the park completed several major planning efforts, including the Trails and Rivers Management Plan, the Cave and Karst Management Plan and the Concessions Facilities Improvement Projects Environmental Assessment. Barclay also guided critical infrastructure improvement investments to the Green River Ferry crossing, the park’s sewage system, multiple commercial services facilities and several cave tour trails.

Barclay has also served in numerous leadership roles across the NPS. His previous assignments include serving as the deputy regional director/chief of staff for the Southeast Region; superintendent of the Outer Banks Group, composed of Cape Hatteras National Seashore, Wright Brothers National Memorial and Fort Raleigh National Historic Site; deputy and acting superintendent at Grand Canyon National Park; and positions within the business services program in the Intermountain Region in Colorado and Washington, D.C.

A native of Texas, Barclay earned a degree in business administration from the University of Texas at San Antonio. He enjoys hunting and working on his home in Bowling Green, Kentucky, that he shares with his wife Lana. They have two children, Cheyanne and Bryce.

 

Kristen Kosick, Deputy Superintendent

Kristen Kosick, Deputy Superintendent

Kristen Kosick assumed duties as the deputy superintendent of Yellowstone National Park in September 2026. As deputy superintendent, Kristen serves in a key leadership role overseeing park operations, including the visitor and resource protection, resource education and youth programs, facilities management and administration divisions, as well as the parkwide safety program.

She returned to the National Park Service after serving as the chief of Michigan State Parks since May 2025. In that role, she worked for the Michigan Department of Natural Resources leading the parks and recreation division, a team of 700 full-time employees and 1,300 summer park workers, serving 38 million visitors annually at 103 state parks, 13,000 miles of trails, 1,200 public boating access sites, and 19 Great Lakes harbors.

Prior to leading Michigan State Parks, Kristen spent 15 years working for the NPS in a variety of administrative, program management and leadership roles for the Office of Legislative and Congressional Affairs and several national parks, including Yosemite, Sequoia and Kings Canyon, Kenai Fjords and Yellowstone. She was in Yellowstone for over five years, serving as the fee program manager and chief of staff, where she gained a comprehensive understanding of park operations and resources, and valuable experience working on leadership priorities, key management issues, legislative affairs and partnerships.

Kristen grew up in Southwest Michigan, graduated from the University of Michigan (go blue!) with a bachelor’s degree in political science, and loves spending time outdoors with her husband Matt and dog Pinecone.

 

More Information

Yellowstone Park Management

Yellowstone boasts a dedicated team of professionals committed to preserving and managing its unique ecosystem.

Strategic Priorities

Learn about the five major priorities set by park managers in 2019, each critical to the success of Yellowstone.