When Gwen Douglas Hester first met Robert Sparks Walker, a notable Chattanooga author and naturalist, she had no idea who he was. “I just thought he was this guy,” Hester says, “that was crazy about birds and flowers and knew more than anybody I’d ever heard talk about them.” Of course, she can’t be blamed for not realizing his significance at the time—because she was only a small child back then. She and other children met Walker while hiking through Audubon Acres , the area that used to be his