Walking from the midwest to the Gulf of Mexico, he kept a journal.  
While working on a machine, his hand slipped, and he nearly lost an eye.  Stunned by the incident, he vowed to look at nature every day of his life thereafter.  Walking from the midwest to the Gulf of Mexico, he kept a journal.  He was the first to attribute Yosemite's spectacular rock formations to glacial erosion, and in 1903, was accompanied by Theodore Roosevelt on a camping trip there.  FTP, name this conservationist, the father of the American National Park system.
While working on a machine, his hand slipped, and he nearly lost an eye.  
John Muir