Methodism is a movement of Protestant Christianity represented by a number of denominations and organizations, claiming a total of approximately seventy million adherents worldwide. The movement traces its roots to John Wesley's evangelistic revival movement within Anglicanism. His younger brother Charles was instrumental in writing much of the hymnody of the Methodist Church. George Whitefield, another significant leader in the movement, was known for his unorthodox ministry of itinerant open-air preaching. The Methodist Church is known for its missionary work, and its establishment of hospitals, universities, orphanages, soup kitchens, and schools to follow Jesus' command to spread the Good News and serve all people.