David Brower was an influential American environmentalist and the first executive director of the Sierra Club. Born in 1912, he played a crucial role in the modern environmental movement, advocating for the preservation of wilderness areas and national parks. Brower was known for his passionate activism and innovative strategies, including the use of legal action to protect natural landscapes. Throughout his career, Brower founded several organizations, including Friends of the Earth and Earth Island Institute. He was instrumental in campaigns to halt dam projects in places like the Grand Canyon and to promote the establishment of protected areas. His legacy continues to inspire environmentalists today.