Leah Elwell

Prior to taking the helm at ISAN, Leah led our programs for almost a decade. She often cannot believe that she has spent the majority of her life working on invasive species issues.  Now more than ever, Leah remains focused on bring partners together to tackle the complexities of invasive species. When not dreaming up new ways to change the world for good, Leah is digging in the dirt, hiking the hills and having fun with her family.


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Marya Spoja

Marya brings with her a decade of experience in the fishing industry. By spending her summers as a fishing guide and in fishing retail, and her winters as a dogsledding guide, her career has long revolved around water in its various forms. Through these experiences Marya has seen first-hand the relationship between water and her local economy, a complex relationship that over time fostered in her a desire to do more for those who enjoy spending time on the water.

When she isn’t guiding or working on our various outreach programs, Marya beats the door down to spend some more time outside.

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Mason Parker

Mason Parker is the newest addition to the ISAN team. He received his MS from the University of Montana in 2019. As a graduate student, he conducted field research with a focus on invasive species. His primary interest was the flowering rush, an aquatic invasive plant quickly spreading through the waters of the western US. Mason brings years of experience in project management to the job, as well as a passion for reducing the spread of invasive species. He spends his free time in a kayak or hiking long trails into the Montana backcountry.

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Robert Wiltshire

Robert Wiltshire founded the Invasive Species Action Network in 2008 realizing that the current efforts to address the aquatic invasive species problem fell short. With a well-rounded career conducting wild trout studies for the state of Montana for over 15 years, small-business entrepreneur in recreation and hobbies, and conservation non-profit manager for more than a decade, Bob navigated his role as executive director with ease.

He played key roles in the management of invasive species over the years including serving on the Montana’s Whirling Disease Task Force, co-authoring the Western States New Zealand Mud Snail Management plan and serving on the National Invasive Species Advisory Committee to the White House.

In 2019, Bob retired from ISAN to pursue his personal goals and hobbies.

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Brant Oswald

Brant has worked in nearly every segment of the fly fishing industry-as a fishing school instructor/director (for both Orvis and the Mel Krieger school program), fishing travel consultant, fly shop manager, commercial fly tier, casting instructor, and now as a guide and outfitter in Livingston, Montana. Over the years, Brant has been active with conservation groups, including CalTrout, the Joe Brooks (Livingston, Montana) Chapter of Trout Unlimited, the Park County Environmental Council, the Governor’s Upper Yellowstone River Task Force and now as the president of the Fishing Outfitters Association of Montana and as the chairman of the ISAN board.

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Dale Sexton

Dale has worked in all aspects of the outdoor industry for over thirty years and currently serves on the board of ISAN. He understands the importance of collaboration in the world of conservation and has been a vital member of the Wilderness Recreation Partnership, the board chairman of the Gallatin Community Collaborative, and a founding member of the Yellowstone Gateway Business Coalition.  Dale’s even taken his passion to Washington D.C. to lobby for the reauthorization of the Land Water and Conservation Fund.  As a fly fishing guide on the Yellowstone, Dale has a special love for protecting the waterways of the Greater Yellowstone Ecosystem.

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