With students at Marian Baker School, San Jose, 1991

Resting at Refugio Frey, Bariloche, Argentina, 2001

Ascending to Laguna Schmoll, Bariloche, Argentina, 2001

Resting along a ridge in the Andes,  Bariloche, Argentina, 2001

  Resting before descending to Refugio Jakob, Bariloche, Argentina, 2001

Along a ridge in the Andes after climbing from Laguna Schmoll, Bariloche, Argentina, 2001

Colleague and students in Santa Rosa National Park, Costa Rica, 1990

With students at Marian Baker School, San Jose, 1991

Santa Rosa National Park, Costa Rica, 1990

Hiking a muddy section of jungle, Santa Rosa National Park, 1990

Getting ready to hike, Bariloche, Argentina, 2001

Hiking around Santa Rosa National Park, Costa Rica, 1990

Lincoln School, 2003

Lincoln School, 2003

With student Tai Kyung Park, Bariloche, 2002