Roger L. Hammer is a senior interpretive naturalist for the Miami-Dade Parks Deparment, director of Castellow Hammock Nature Center, a member of the board of directors of the Tropical Audubon Society, and an active volunteer, class instructor, and field-trip leader for Fairchild Tropical Garden in Miami. He received the first Marjory Stoneman Douglas Award and the Charles Brookfield Medal. He is also the author of Everglades Wildflowers and Florida Keys Wildflowers.

Roger L. Hammer is a senior interpretive naturalist for the Miami-Dade Parks Deparment, director of Castellow Hammock Nature Center, a member of the board of directors of the Tropical Audubon Society, and an active volunteer, class instructor, and field-trip leader for Fairchild Tropical Garden in Miami. He received the first Marjory Stoneman Douglas Award and the Charles Brookfield Medal. He is also the author of Everglades Wildflowers and Florida Keys Wildflowers.

Roger L. Hammer is a senior interpretive naturalist for the Miami-Dade Parks Deparment, director of Castellow Hammock Nature Center, a member of the board of directors of the Tropical Audubon Society, and an active volunteer, class instructor, and field-trip leader for Fairchild Tropical Garden in Miami. He received the first Marjory Stoneman Douglas Award and the Charles Brookfield Medal. He is also the author of Everglades Wildflowers and Florida Keys Wildflowers.