Mark P. Shea is a popular Catholic writer and speaker. He is the author of numerous books including By What Authority? An Evangelical Discovers Catholic Tradition. His articles have appeared in numerous magazines and he is known nationally for his one minute "Words of Encouragement" on Catholic radio. Shea also maintains the popular blog Stumbling Towards Heaven. In addition, Mark is an internationally known speaker on various issues in Catholic faith and life. He lives in Washington State with his wife, Janet, and their sons.