Jennings serves as a husband, father (three daughters), grandfather (four grandchildren), networker, instructor, preacher, scholar, and author. Raised in the U.S., missionary in Japan 1986-1999 (church-planting and taught at Tokyo Christian University), taught at Covenant Theological Seminary (1999-2011), director at Overseas Ministries Study Center (2011-2015). Currently with Onnuri Church as a mission pastor, consultant, and international liaison, also editor of Global Missiology – English and involved in other mission research projects. Author of several books and articles.