Adam Fifield's work has appeared in the New York Times, Washington Post, Christian Science Monitor, Chicago Sun-Times, Village Voice, Philadelphia Magazine, and Philadelphia Inquirer, where he was a staff writer. He is also the author of A Blessing Over Ashes (William Morrow, 2000), a memoir about his Cambodian foster brother. From 2007 to 2013, he served as the Deputy Director of Editorial and Creative Services at the U.S. Fund for UNICEF.

A Mighty Purpose chronicles the work of Jim Grant, hailed by Nicholas Kristof as a man who "probably saved more lives than were destroyed by Hitler, Mao, and Stalin combined." Nominated by President Jimmy Carter in 1979 to head UNICEF, Grant ran the children's agency for 15 years and became the most powerful advocate for children the world has ever seen. He spearheaded a near quadrupling of worldwide immunization rates and launched a movement that saved tens of millions of children's lives and profoundly altered the face of global health and international development. An American and World War II veteran, he at first met fierce resistance at the UN and in his own organization. Some thought his ideas were crazy and dangerous, but as he kept pushing and kept toppling obstacle after obstacle, he eventually won over even his most stubborn detractors. He broke rules, cut corners and upended a venerated UN agency. This is the untold story of a man who believed the impossible to be possible and proved that the benefits of progress can reach everyone.