Wang Chin-yun, a Buddhist nun born in Taiwan in 1937 and now known as the Venerable Master Cheng Yen, is one of the world's most inspiring yet largely unrecognized women. At the age of 29, she established the Tzu Chi Foundation, an organization committed to compassion and relief that today numbers 5 million volunteer members in more than 45 countries worldwide, including the United States. In the United States, Tzu Chi members provided assistance during many catastrophic events including the 1992 Los Angeles riots, the 9/11 attacks in New York, and Hurricane Katrina in 2005. "Challenges" details Master Yen's extraordinary vision, her tenacity in the face of numerous hurdles, and the lessons she and her followers have learned over the years.