Seidl is board president of Miracle League of Green Bay, an adaptive baseball field for children with special needs. Seidl organized focus groups to raise community awareness and then led a fundraising campaign that has raised more than $750,000 to build and maintain the field, stands, and concessions and add an adaptive playground. With a rubber surface, special equipment, and volunteer helpers, children with disabilities can participate in a real baseball experience with their families cheering them on. Players wear Major League Baseball–styled uniforms, and a state-of-the-art sound system at the park broadcasts the play-by-play.