Greg Mortenson is an American humanitarian and author known for founding the Central Asia Institute and writing the bestselling books "Three Cups of Tea" and "Stones into Schools". After climbing K2 in Pakistan, he was cared for in the village of Korphe and promised to build a school in return. He has since built over 170 schools in Pakistan and Afghanistan. However, in 2011 questions arose about the accuracy of some details in his books and financial practices at his charity.