Mary Gibbs and the Mississippi headwatersWho was Mary Gibbs? How did she help to protect the Mississippi headwaters? All these questions will be answered on a walk from the Mary Gibbs Mississippi Headwaters Center to the Mississippi headwaters. Learn about the incredible Mary Gibbs and her work as the first female park commissioner of the nation from 1 to 1:30 p.m. on Thursday, Aug. 20. Meet at the Mary Gibbs Mississippi Headwaters Center.