- This man was a Scottish-American naturalist, author, and early advocate of preservation of wilderness in the United States.
- He was a co-founder of the Sierra Club and served as the first President of the club.
- His name has been used for the name of a national monument, a glacier, a beach, a mountain, a college, a long distance hiking trail, a highway and more. He was featured on a postage stamp in 1964 and is on the back of the 2005 California State Quarter.
- He published six volumes of writings that described his explorations of the outdoors. Four more books were published after his death and several additional books were subsequently published that collected essays and articles from various sources. He was a huge advocate for Yellowstone and the Sierra Nevada mountains and is often quoted all over the internet.
- In 1903 President Theodore Roosevelt camped in the Yosemite Valley with this man. This camping trip is in many ways credited to the eventual federal control of the valley and the designation of Yosemite National Park.
Do you know who we are talking about? Surely you've seen his quotes posted on Facebook, Twitter or a bumper sticker. Enter your guess in the comments below.
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