The famous environmentalist whose biography centers on their advocacy for the conservation of nature is John Muir. Known as the "Father of the National Parks," Muir was instrumental in the establishment of several U.S. national parks, including Yosemite. His writings and activism emphasized the importance of preserving natural landscapes and biodiversity. Muir’s work inspired the conservation movement in the early 20th century and laid the groundwork for future environmental protection legislation. His commitment to nature and eloquence in expressing its beauty resonate throughout his biography, highlighting his enduring legacy in American environmentalism.