John Muir was a Scottish-American naturalist, author, and environmental philosopher who played a pivotal role in the establishment of national parks and the preservation of wilderness areas in the United States.

Rachel Carson was an American marine biologist and conservationist whose book 'Silent Spring' exposed the detrimental effects of pesticides, particularly DDT, on the environment and human health.

Aldo Leopold was an American ecologist, forester, and writer who is considered a pioneer in the field of conservation. His book 'A Sand County Almanac' introduced the concept of 'land ethic', which advocates for a respectful and responsible relationship between humans and the natural world.

Dian Fossey was an American primatologist and conservationist who dedicated her life to studying and protecting mountain gorillas in Rwanda. She founded the Dian Fossey Gorilla Fund, which continues to work towards the conservation of gorillas and their habitat.

Jane Goodall is a British primatologist and anthropologist who has conducted extensive research on chimpanzees in Tanzania. Her work has provided valuable insights into their social behavior, intelligence, and emotional capabilities, challenging traditional views of human exceptionalism.

Biruté Galdikas is a Canadian primatologist and anthropologist who has dedicated her life to studying and protecting orangutans in Borneo. She founded the Borneo Orangutan Survival Foundation, which works to conserve orangutans and their habitat, as well as promote sustainable practices in the region.

David Attenborough is a British broadcaster, natural historian, and author who has produced numerous documentaries and television programs about the natural world. His work has played a significant role in educating the public about environmental issues and inspiring conservation efforts worldwide.

George Rabb was an American conservationist and zoologist who dedicated his life to the conservation of sea turtles. He founded the Sea Turtle Conservancy, which works to protect sea turtles and their nesting beaches, as well as promote sustainable fishing practices.

Sylvia Earle is an American marine biologist, oceanographer, and explorer who has dedicated her life to marine conservation. She is known for her work on the protection of coral reefs and her advocacy for marine sanctuaries and sustainable ocean practices.

Russell Mittermeier is an American primatologist and conservationist who has dedicated his life to the conservation of primates. He founded Primate Conservation Inc., which works to protect primates and their habitats, as well as promote sustainable practices in primate range countries.

Thomas Lovejoy is an American ecologist and conservationist who has dedicated his life to the conservation of tropical rainforests. He founded the Amazon Conservation Association, which works to protect rainforests and promote sustainable development in the Amazon region.

George Archibald is an American ornithologist and conservationist who has dedicated his life to the conservation of birds. He founded the American Bird Conservancy, which works to protect birds and their habitats, as well as promote sustainable practices in bird-friendly landscapes.

Luc Hoffmann was a Swiss ornithologist and conservationist who dedicated his life to the conservation of wetlands. He founded Wetlands International, which works to protect wetlands and promote sustainable water management practices worldwide.

Alan Rabinowitz is an American zoologist and conservationist who has dedicated his life to the conservation of large carnivores. He founded the Panthera Foundation, which works to protect big cats and their habitats, as well as promote coexistence between humans and wildlife.

Cynthia Moss is an American zoologist and conservationist who has dedicated her life to the conservation of elephants. She founded the Amboseli Elephant Research Project, which has been studying the behavior and ecology of elephants in Kenya for over 40 years.