C. Peter Wagner was an influential American theologian and missiologist, known for his work in the field of church growth and the development of new church movements. He served as a professor at Fuller Theological Seminary and authored numerous books, contributing significantly to the understanding of how churches can expand and thrive. Wagner was also a key figure in the New Apostolic Reformation, a movement that emphasizes the role of modern-day apostles and prophets in the church. His teachings and writings have impacted many church leaders and organizations, shaping contemporary Christian thought and practice.