Inside Region 3
Midwest Region
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Meet The Horicon National Wildlife Refuge and
Leopold Wetland Management District Complex

The Horicon National Wildlife Refuge/Leopold Wetland Management District Complex spans the eastern half of Wisconsin, including Fox River, Gravel Island, and Green Bay National Wildlife Refuges. Leopold Wetland Management District contains 13,500 acres of marsh, prairie, and savanna habitat for migratory birds and rare species including the Karner blue butterfly and eastern prairie fringed orchid. Several WPAs near Madison are popular destinations for bird watching, hiking, environmental interpretation, and hunting in a suburban setting. Horicon Refuge surrounds the northern two thirds of Horicon Marsh, the largest cattail marsh in the U.S.  This iconic Canada goose migratory staging area also supports Wisconsin’s only breeding populations of black-necked stilts and glossy ibis. The refuge’s Sense of Wonder Discovery Trail facilitates natural world exploration by youth of all ages. Gravel Island and Green Bay Refuges collectively encompass eight Lake Michigan islands in Wisconsin and Michigan. Spider and Pilot Islands host Wisconsin’s largest colonial nesting bird colonies and Gravel Island supports the largest Caspian tern colony in the Great Lakes Region. A short ferry ride from the Door Peninsula mainland brings summertime visitors to Plum Island to explore the former U.S. Coast Guard lifesaving station and navigation lights at the mouth of Green Bay.

Bill Peterson

Bill Peterson

Bill Peterson began his U.S. Fish and Wildlife Service career in 1994 as a summer intern at Sherburne National Wildlife Refuge. He worked at the Wisconsin Private Lands Office and Necedah, Wisconsin, Wapanocca, Arkansas and Parker River, Massachusetts National Wildlife Refuges prior to becoming the Horicon Refuge/Leopold Wetland Management District Complex Project Leader in June 2019.  He’s still learning his way around the Complex! Peterson has a B.S. in Fisheries and Wildlife from the University of Minnesota and an M.S. in Wildlife Science from Louisiana State University.  Outside of work, he enjoys spending time with his wife and two young children, running with the family dog, trapping, and waterfowl hunting.

 

Dave Bolin

Dave Bolin

Dave Bolin grew up in Michigan and has been the Horicon Refuge/Leopold Wetland Management District Complex Deputy Project Leader since 2015. Bolin’s 24-year career working for the Service has all been with the Refuge System. His career has offered him the opportunity to work in 4 regions and at 8 different refuges and wetland management districts including Lacreek Refuge, South Dakota, Crab Orchard Refuge, Illinois, St. Croix Wetland Management District, Wisconsin, Chase Lake Prairie Project and J Clark Salyer Refuge/Wetland Management District, and Des Lacs Refuge, in North Dakota, and Alaska Maritime Refuge.  Bolin’s career in refuge management has largely focused on waterfowl and grassland bird/ habitat conservation.  He enjoys hunting, fishing, watching sports, and spending time with his wife, son, daughter, and 2 mini Australian shepherds. Bolin is most proud of his family’s willingness to support his career by moving to all these neat places and always taking on the next adventure waiting there.


 

Bruce Luebke


Bruce Luebke

Bruce Luebke is a Wildlife Refuge Specialist at the Leopold Wetland Management District.  He began his Service career at the Driftless Area Refuge/Upper Mississippi River National Fish and Wildlife Refuge working mostly with rare snails and plants. Then it was on to the Cape May Refuge, New Jersey, where he had the opportunity to assist on a large red knot project on the Delaware Bay that included multiple trips to the Arctic and Tierra del Fuego just off the southernmost tip of South America. Bolin arrived at the Leopold Wetland Management District in 2003 and enjoys the diversity of duties across the Complex, including settling into a brand-new office – finally! Outside of work he enjoys glamping in a teardrop trailer and looks forward to completing more of the Camino Trail in Spain.


 

Dustan Hoffman

Dustan Hoffman

Dustan Hoffman’s passion for outdoor adventures and fly fishing led him to Winona, Minnesota where he attended Saint Mary’s University, completing an undergraduate degree in Environmental Biology, and an M.S. in GIS and Resource Analysis. His career with the Service also began in Winona at the Upper Mississippi River Refuge.  Hoffman was blessed with a Pathways Career Internship at Seney Refuge, afforded opportunities to work stints at Trempealeau Refuge, Wisconsin, and Hackmatack Refuge, Illinois (all districts of the “Upper Miss”) and eventually landed a permanent position as a Wildlife Refuge Specialist at the Horicon Refuge Complex.  As the Manager of the Green Bay and Gravel Island Refuges, he enjoys the opportunities of working with an active Friends Group (Friends of Plum and Pilot Islands), operating a boat on the waters of Lake Michigan to remote islands, showcasing historic maritime structures from the 1896 era, and getting a glimpse of working with island ecosystems.


 

Derek Casbon

Derek Casbon

Derek Casbon is the Fire Management Specialist for the Leopold Wetland Management District.  He grew up in Valparaiso, Indiana and pursued a career in Wildland Fire after receiving his B.S. in Natural Resources from Ball State University, Indiana, in 1995.  Casbon has worked in multiple states throughout his career, including working on Engine Crews in Indiana and Wyoming, as a Fire Suppression Specialist in Alaska and as a Foreman for the Arrowhead Hotshots in California, before coming to the Service in 2007.  He spends a majority of his off time running kids to high school athletics and traveling with his wife Shannon, while enjoying a round of golf when time allows.


 

Mandy Dorsch

Mandy Dorsch

Mandy Dorsch is the Administrative Officer for the Horicon Refuge/Leopold Wetland Management District Complex. A lot of you may know her better by her former name of Mandy Kline. She attended Northland College and has a B.S. in Biology. Her Service career started as a part time GS-5 Administrative Technician at the Regional Sign Center in Winona, Minnesota, shortly after college in June 1996. After the Sign Center closed its doors, she transferred to Horicon Refuge in October 2007. Dorsch has grown up with a love of the outdoors from when she was small and followed her dad around as he did his job with the Service in New Mexico, Iowa and Wisconsin. She now enjoys spending time with her new husband, their two cats, Smokey and Marshmallow, black lab, Gunnar and 17 chickens on their 21-acre homestead.


 

Frank Gercz

Frank Gercz

Frank Gercz is a Biological Science Technician at the Horicon National Wildlife Refuge. He has worked at Horicon since 2015 and was a Park Ranger and Volunteer Coordinator prior to assuming his Bio-Tech position in 2019. Gercz has a B.S degree in Natural Resources from the University of Wisconsin-Madison. His interests include fishing, kayaking, dogs, photography and native landscape restoration. Having two children—a son and a daughter who are successful on their own is his proudest achievement.


 

Robert Hamilton

Robert Hamilton

Robert Hamilton has worked at Leopold Wetland management district as the Maintenance Mechanic for the past five years. He previously served in the U.S. Navy submarine service and performed underwater construction using remote operated vehicles for the offshore oil industry.  Hamilton was a refuge volunteer prior to his current position. He hunts, camps, completes endless home improvements, and participates in other various shenanigans during his spare time.


 

Mary Hull

Mary Hull

Mary Hull is an Intermittent Office Clerk at Horicon Refuge. She spends most of her time working at the front desk answering visitor questions. Hull has been at the refuge for 21 years and began as a volunteer book reader to local school children through a national program called Rolling Readers. It was a lot of fun and the kids were just great, she said. Hull lives on a 16-acre plot of land where she and her husband have installed five ponds and planted prairie to create their personal wildlife area.


 

Duane Ketter

Duane Ketter

Duane Ketter has worked as a Seasonal Maintenance Worker at Horicon Refuge for the past 15 years. He previously worked at Horicon Wildlife Management Area for 39 years. Ketter’s childhood home was near the marsh, leading to his first experience on the marsh as a participant in the 1963 goose management hunt. That hunting experience sparked his interest in natural resources related work. Prior to becoming a maintenance worker on the marsh, Ketter is proud to have served in the U.S. Army from 1964-66. His favorite pastimes are woodworking, maintaining pollinator habitat in his front yard, and attending his grandchildren’s ball games.


 

Jon Krapfl

Jon Krapfl

Jon Krapfl is a Wildlife Biological Science Technician at the Horicon Refuge Complex. He has a B.S. in Biology from the University of Wisconsin-Green Bay. Krapfl began working at the refuge in 1992 as a volunteer college intern and later became a bio-tech in 1993. He assists the complex with water management, habitat management, bird surveys, vegetation surveys, GIS, and data management. In his spare time, Krapfl likes running, biking, gardening, hunting and trapshooting.  He enjoys going to Lambeau Field to cheer on the Packers.


 

Mike Madel

Mike Madel

Mike Madel has worked as a Maintenance Mechanic at Horicon Refuge since 1997. He went to school for diesel mechanics and was previously employed in the private sector and as a U.S. Army Reservist. Madel enjoys all outside activities and spending time with his sons.


 

David Moul

David Moul

David Moul has been a Biological Technician at Horicon Refuge since 2018.  He has a B.S. in Resource Management from the University of Wisconsin – Stevens Point. Both his early childhood experiences of growing up on the Horicon Marsh and his passion for the outdoors has led him to his current position. Moul previously served in the U.S. Army from 2008-2013. His two years in Afghanistan equipped him with the necessary adaptability skills to overcome rugged terrain and to gain an appreciation of teamwork. In his spare time Moul can be found hunting, fishing, collecting wild edibles and exploring new areas. He has a strong conviction to support local farmers and enjoys creating delicious meals with the goods they provide.


 

Sadie O’Dell

Sadie O’Dell

Sadie O’Dell is a Wildlife Biologist at Horicon Refuge. Having grown up near the Horicon Marsh, she has a strong sense of attachment to the marsh and a deep appreciation for conserving and enhancing its natural resources. O’Dell received her B.S. degree in Ecosystem Management and Restoration from the University of Wisconsin – Stevens Point. Her first job with the Service was at Fergus Falls Wetland Management District, Minnesota, as a Private Lands Biologist.  Outside of work, she enjoys spending time with family and friends, traveling, hiking, camping, and yoga.


 

Adrian Potwin

Adrian Potwin

Adrian Potwin is a Federal Wildlife Officer and retired U.S. Marine Corps veteran who has been with the Service for the past four years. His first duty station was the San Luis Valley Complex in southern Colorado where he primarily worked with elk and waterfowl hunters. However, he recently transferred to the Horicon Refuge/Leopold Wetland Management District Complex in an attempt to expand his skills and becoming more proficient with trapping and fishing. Potwin has been in law enforcement for a total of 13 years, is working on a degree in Environmental Science, and is very passionate about using his platform to serve underprivileged youth. On his days off he enjoys exploring the outdoors with his wife and two sons. Typical activities include; hiking, fishing, mountain-biking, skiing, camping and swimming. Potwin also loves football and working on home remodeling projects.


 

Erin Railsback

Erin Railsback

By the third grade, Erin Railsback knew she wanted to work in natural resources. Growing up in rural southern Illinois, she spent a lot of time roaming the forest and swamps learning to identify birds, bugs and other outdoor things. Her “aha moment” came while she was assisting with a school group while volunteering at a local wildlife refuge. Next came a summer Youth Conservation Corps position at Cypress Creek NWR, Illinois, followed by completing a B.S. in Wildlife Biology from Southeast Missouri State University. After some temporary work with various natural resource agencies in Illinois, Missouri and Georgia, she joined the Service as a SCEP student in 2003, completing an M.S. in Parks, Recreation and Tourism at the University of Missouri and then moving “up north” to snowy Wisconsin to work as a Park Ranger at Horicon Refuge. She spends her free time building Lego creations, watching cartoons and playing outside (all activities she enjoys with her six-year-old son) and also turkey hunting, hiking, and tying flies.

 

Sean Sallmann

Sean Sallmann

Sean Sallmann has worked as the Fire Management Specialist at Horicon Refuge since 2004.  Prior to that he worked for Leopold Wetland Management District as a Biological Technician/Fire Technician working with the Partners for Fish and Wildlife Program. His ties with the Service started in 1999 when he was restoration specialist for Wisconsin Waterfowl Association working on the Wetland Reserve Program and stationed out of the Horicon Refuge/Leopold Wetland Management District office. Sallmann has a B.S. from University of Wisconsin – Stevens Point with a major in Watershed Management and minors in Biology and Soil Science.  Outside of work, he enjoys hunting, fishing, kayaking and spending time with his family and friends.


 

Rachel Samerdyke

Rachel Samerdyke

Rachel Samerdyke has been with the Service for 17 years as a Partners for Fish and Wildlife Program Private Lands Biologist at the Horicon Refuge/Leopold Wetland Management District Complex. Within a 10-county area in southeastern Wisconsin, she provides technical and financial assistance to private landowners who are willing to work with the Service on a voluntary basis to help meet the habitat needs of our Federal Trust Species, including migratory birds and threatened and endangered species. Projects include restoring native prairies, wetlands, oak savannas, and streams. Samerdyke earned a B.S. in Wildlife Biology from the University of Wisconsin – Stevens Point and an M.S. in Wildlife and Fisheries Science from South Dakota State University. She has worked for various natural resource agencies in Minnesota and South Dakota. Outside of work, she enjoys hiking, hunting, birding, gardening, photography and having fun with friends and family.


 

Sherry Schwoch

Sherry Schwoch

Sherry Schwoch has been an Intermittent Office Clerk at Horicon Refuge for 22 years. Most of her time is spent working at the front desk assisting visitors. She also gets to tell them where to go, meaning how to navigate the refuge and find wildlife, of course. During her time at the refuge, Schwoch has been involved in many exciting things, such as dressing up in a whooping crane costume at the Experimental Air Show in Oshkosh and putting on hip boots to wade the marsh to help with projects. Her husband Dan and she will celebrate their 55th wedding anniversary in June of 2020. They have four children and 15 grandchildren. Schwoch is an avid Elvis fan and collector, loves turquoise and silver jewelry (visitors always remember her rings) and enjoys taking the Harley out for a cruise as much as possible.


 

Kevin Organ

Kevin Organ

Kevin Organ started as a Seasonal Range Technician (Fire) with Horicon NWR/Leopold WMD Complex in 2018.  Prior to working with the Service he spent three seasons at Mt. St. Helen’s National Volcanic Monument on the Gifford Pinchot National Forest in Washington in the same position. Organ has an Associate’s Degree in Wildland Fire from Fox Valley Technical College, Wisconsin, and is currently completing his Bachelor’s degree at University of Wisconsin – Oshkosh. When not working or in school he enjoys hiking, kayaking. and playing disc golf.



Last updated: September 9, 2019