In 1970, with nine staff members (pictured: Judy Moody and Denis Hayes on April 22, 1970) and a $125,000 budget, a Washington, D.C.-based group organized the Environmental Teach-in, which would become became the first Earth Day.
With then senator Gaylord Nelson of Wisconsin as their champion, the staffers brought together volunteers in dozens of cities and college campuses around the country.
Hayes, who had dropped out of Harvard Law School the year before to join Senator Nelson's project, also chaired the Earth Day anniversary celebrations in 1990 and 2000.
"[Hayes was] the one who did the unglamorous, wearisome job of starting it up," Ralph Nader told the New York Times
in 1990. "[Hayes] is an orchestrator of environmental events which were national ... and now are global."
Photograph from AP