Jane Goodall transformed the study of animal behavior through decades of patient observation of wild chimpanzees at Gombe in Tanzania. Beginning her work in 1960 without the conventional academic background of most scientists, she discovered behaviors that challenged long-held assumptions about the uniqueness of human intelligence. Her most famous breakthrough came when she observed chimpanzees modifying and using twigs to extract termites. At the time, toolmaking was widely regarded as a defining human trait. Goodall also documented individual personalities, social bonds, hunting, conflict, maternal relationships, cooperation, and learning, helping scientists understand chimpanzees as socially and emotionally complex beings. Her influence later expanded from research to conservation. Through the Jane Goodall Institute and the Roots & Shoots program, she connected wildlife protection with community development, education, and environmental responsibility, inspiring generations of young people to participate in conservation. Goodall’s lasting achievement was not simply proving that chimpanzees were intelligent. She changed the way humans thought about the boundary between ourselves and other animals. By teaching the world to observe with patience and humility, Jane Goodall became one of the voices that changed the world.