2026 Executive Committee Nominees
President Elect
Dan Sonntag is a licensed landscape architect with more than 20 years of experience practicing landscape architecture. He currently serves with Salt Lake County Parks & Recreation, where he manages the development of community and regional recreation projects that improve quality of life and expand access to outdoor recreation for county residents.
Dan's career has focused on creating sustainable, accessible, and community-centered public spaces through collaborative planning, thoughtful design, and strategic investment in public infrastructure. His experience includes park master planning, trail systems, recreation facilities, playgrounds, sports complexes, and open space preservation projects.
Dan is a graduate of Utah State University and Penn State University, with studies in Watershed Stewardship and Wetland Science. He brings both environmental and recreation-focused perspectives to landscape architecture and public land stewardship.
Dan is excited for the opportunity to serve as President-Elect of the Utah Chapter of ASLA and looks forward to supporting the profession and engaging with landscape architects across the state.
President
Devon Dillinger is a Utah-licensed landscape architect with nearly 2 decades of experience in landscape architecture and urban planning, with a focus on public parks, recreation, aquatic, campus, civic, and urban design projects throughout the country. He is licensed in Utah and 5 other states, CLARB certified, and a Sustainable SITES Initiative Accredited Professional. Devon earned his Bachelor of Landscape Architecture with a minor in Urban and Regional Planning from Texas A&M University.
Devon has been involved with ASLA since 2004 and brings chapter leadership experience from multiple states, including previously serving as President of the Iowa Chapter of ASLA, chairing the ASLA Central States Hotel and Event Planning Committee, and serving nationally on the ASLA Nominating Committee and the Licensure and State Government Affairs Committee. He also contributes to the profession through CLARB as a LARE Exam Committee Writer and through GBCI as the SITES AP representative on the Credentialing Steering Committee.
Since moving to Utah, Devon has been actively involved with ASLA Utah, serving as the Climate Action & Biodiversity Chair and stepping into the interim President-Elect role due to an unforeseen vacancy. He looks forward to continuing to serve ASLA Utah as President by supporting members, strengthening chapter engagement, advancing advocacy and licensure, and elevating the visibility and impact of landscape architecture across the state.
Secretary
Jeff Coons is a licensed Landscape Architect whose work centers on creating memorable places through native planting design, placemaking, and dark-sky-sensitive landscapes. Drawing on specialized research in dark sky preservation, Jeff brings a unique perspective to projects that seek to balance human experience, ecological responsibility, and the beauty of the natural environment.
After earning his Master of Landscape Architecture degree from the University of New Mexico, Jeff joined GSBS Architects, where he contributes to civic, religious, educational, and private-sector projects throughout the region. He is particularly interested in how landscapes can foster connections to community, to place, to heritage, and to the night sky.
As a firm believer that we are stronger together, Jeff is seeking a term as ASLA Utah Secretary, a position where his passion for landscape architecture can help both professionals and the community come together and realize the potential for the spaces we build and the connections that we make.
Treasurer
Adam Castor currently works for Langvardt Design Group in Salt Lake City. After graduating from the USU LAEP program, Adam has spent the past 20 years collaborating and working with planners, architects, engineers, contractors, clients, and governing agencies with several multi-disciplinary firms in Utah and Colorado. Adam also has considerable experience in landscape maintenance/construction, and wholesale nursery operations and management. An ASLA member since 2003, Adam has served as the Utah Chapter Activities Committee Chair, Chapter Presidency, and currently as Chapter Treasurer. Adam recognizes the importance of ASLA organization and the Utah Chapter as advocates and defenders of the landscape architecture profession and as leaders in climate positive design.