1872 - 1937
- Poet and ornithologist, and a prolific writer.
- Director of the Natural History Museum at the California Academy of Sciences in San Francisco.
- Keeler was a charter Sierra Club member. Keeler met Muir through artist William Keith
- Keeler was Muir's cabin-mate aboard the George W. Elder on the Harriman Alaska Expedition (1899).
- He worked for the preservation of the Berkeley hills
- Recollections of John Muir by Charles Keeler
- "To Joseph LeConte" by Charles Keeler, a poem read at the Wild Flower Show in 1907 at the LeConte Memorial Lodge (now the Yosemite Conservation Heritage Center), attended by John Muir.
- The Simple Home - by Charles Keeler - A short book promoting rustic homes (often referred to as "Arts & Crafts Architecture") and a healthy lifestyle
- Biography from Harriman Expedition Retraced