Through this work with Tree Climbing Japan, John later established Treehab® (Tree Climbing Therapy® and Tree-Assisted Therapy® programs) that enables people of all abilities to climb the world's largest trees.
In the summer of 2001, Hikosaka Toshiko became the first severely physically-challenged person to climb atop an 80-meter giant Sequoia tree. (Smithsonian, March 2002)
Tree-Assisted Therapy continues to help physically-challenged individuals climb trees and also strives to create international exchanges through tree climbing.
As a keynote speaker
for the Japanese Ministry of Parks and Education
, John strongly encourages sustainable forestry and eco-lumber, and discourages the import of old-growth logs and lumber into Japan.