Richard Foster is an American author and theologian best known for his writings on spiritual formation and Christian spirituality. He gained prominence with his book, Celebration of Discipline, published in 1978, which explores various spiritual practices that can deepen one's faith and relationship with God. Foster's work emphasizes the importance of disciplines such as prayer, meditation, and service. In addition to his writing, Foster is the founder of Renovaré, a Christian organization dedicated to promoting spiritual renewal and growth. He has also served as a professor and speaker, sharing insights on how individuals can cultivate a more meaningful spiritual life through intentional practices and community engagement.