This episode of The Green Tunnel shares the story of three changemakers who combined led, and continue to lead, the trail through its 100 years of history. From the earliest days with Jean Stephenson, legal battles with Ruth Blackburn, to a new future with Sandi Marra, these leaders of the Appalachian Trail project have proven themselves pivotal in its history. Show notes, including a full transcript, available at greentunnel.rrchnm.org.