An international expert on solar energy and forestry, John Perlin has lectured extensively on these topics in North America, Europe, Asia, and Australia. Perlin is the author of A Forest Journey: The Story of Wood and Civilization. He has mentored those involved in realizing photovoltaic, solar hot water, and energy-efficiency technologies at the University of California, Santa Barbara (UCSB), where he is a visiting scholar in the department of physics.