Michael Pelkey and Brian Schubert make the first BASE jumping from El Capitan, a prominent rock formation in Yosemite National Park in 1966. Both would suffer injuries though because of it. :
First Jump Course | 50calBASE
Photos: Carl Boenish and the early days of BASE jumping | CNN
I built a rig from scratch and jumped it on my first base jump : r/SkyDiving