Age: 52
Occupation: Humanitarian and author
Previous TIME 100 Appearances: 0
Co-founder and executive director of the nonprofit Central Asia Institute, which promotes education, especially for girls, in far-flung areas of Pakistan and Afghanistan, Mortenson is also an author: his 2006 book, Three Cups of Tea, has sold more than 3.5 million copies around the world. His 2009 follow-up, Stones into Schools, is a best seller as well.