Philosopher of religion, lay theologian, and biblical exegete, Baron Friedrich von Hügel was a remarkable man who set out to write a biography of Saint Catherine of Genoa and ended up writing an extensive and brilliant treatise on the "philosophy of mysticism."

Fritz Lobinger is a priest, a missionary and a theologian. He is the author of Like His Brothers and Sisters.

Gary H. Gossen, principal editor of this volume, is Professor of Anthropology and Latin American Studies at the University of Albany, State University of New York.

Gary MacEoin (1909-2003) was a human rights activist focused on issues of Latin American poverty and U.S. immigration policy. He was involved in the "sanctuary" movement and other progressive causes. He was the author of 25 books.

George V. Coyne, Ph.D., S.J., is a Jesuit priest, distinguished astronomer, director of the Vatican Observatory, and head of the Observatory’s research group which is based at the University of Arizona in Tucson. Parallel to his scientific research he has developed an interest in the history and philosophy of science and in the relationship between science and religion. In 2008 he received the Mendel Medal.

George W. Rutler is best known as the host of a weekly program on EWTN and as the pastor of Our Saviour in Midtown Manhattan, where he lives. A convert from Anglicanism, he has published a number of books on Catholic history and love.

George Weigel is the Vatican analyst for NBC News. He is the author of numerous books, including Witness to Hope: The Biography of Pope John Paul II, and his weekly column, “The Catholic Difference,” is syndicated to 60 newspapers around the United States. He has been awarded 10 honorary doctorates, the papal cross Pro Ecclesia et Pontifice, and the Gloria Artis Gold Medal by the Republic of Poland. He lives in North Bethesda, Maryland.

Gerald May, M.D. (1940-2005), practiced medicine and psychiatry for twenty-five years before becoming a senior fellow in contemplative theology and psychology at the Shalem Institute for Spiritual Formation in Bethesda, Maryland. May was a pioneer in blending spirituality and psychology and encouraging a healthy, balanced lifestyle.