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Studied and worked on the conservation of mountain gorillas in Rwanda. Founded the Dian Fossey Gorilla Fund International.

First Chief of the U.S. Forest Service and advocate for the sustainable management of natural resources. He coined the term 'conservation ethic'.

26th president of the United States. Established numerous national parks, forests, and monuments to preserve wildlife and natural resources.

Nobel Peace Prize laureate. Founded the Green Belt Movement in Kenya, which focuses on tree planting, conservation, and women's rights.

A field biologist famous for his studies of mountain gorillas, tigers, and pandas. His emphasis on fieldwork has influenced conservation practices worldwide.

Developed the theory of natural selection and evolution by means of natural selection. Wrote 'On the Origin of Species' which transformed the way we understand biological diversity.

Known as 'Father of the National Parks' in the United States. Co-founded the Sierra Club and played a crucial role in the creation of Yosemite National Park.

Broadcaster and natural historian who has presented the 'Life' series of wildlife documentaries. Advocates for conservation through education and mass media.

Brazilian rubber tapper, trade union leader, and environmentalist who fought to preserve the Amazon rainforest. His activism led to the idea of 'extractive reserves'.

Renowned for her work with chimpanzees in Tanzania. Advocated for conservation and animal welfare rights. Founded the Jane Goodall Institute.

Wrote 'A Sand County Almanac' and promoted the land ethic concept. His philosophy was influential in modern environmental ethics and wilderness conservation.

Biologist and naturalist known for his work on ant ecology, biodiversity, and biophilia. Advocated for the conservation of half the Earth's land and sea to preserve biodiversity.

Known as 'The Crocodile Hunter', he was a passionate conservationist, zookeeper, and television personality who worked to educate people about wildlife.

Naturalist, ornithologist, artist, and educator known for his pioneering work on bird field guides. His guides have educated millions on birds and conservation.

Wrote 'Silent Spring', which led to public awareness of environmental issues and the eventual ban of DDT. Known as the mother of the modern environmental movement.

Often called the 'Grandmother of the Conservation Movement', she was instrumental in passing the Wilderness Act and helped create the Arctic National Wildlife Refuge.

Known for founding the World Wide Fund for Nature (WWF). Also recognized for his work on conservation wetlands and wildfowl.

Marine biologist, explorer, and author known for her research on marine algae and her advocacy for marine conservation. She was the first female chief scientist of NOAA.

Host of the television show 'Mutual of Omaha’s Wild Kingdom'. He brought wildlife and conservation awareness to the homes of millions through television.