John Muir’s contributions to conservation and national parks are significant, yet his legacy is marred by his era’s racist views toward Native Americans and other ethnic groups. Notably, Muir was instrumental in the creation of the National Park system and co-founded the Sierra Club. His writings inspired many to value and protect nature, infusing the environmental movement with respect and stewardship philosophies. However, critical examination of his life reveals a complex figure with profound achievements alongside reflective prejudices of his time.