He has been looked upon as one of the most influential preachers of the 20th century. He held large indoor and outdoor rallies with sermons that were broadcast on radio and television, some still being re-broadcast into the 21st century. In his six decades of television, Graham hosted annual Billy Graham Crusades, which ran from 1947 until his retirement in 2005. He also hosted the popular radio show Hour of Decision from 1950 to 1954. Graham preached to live audiences of nearly 215 million people in more than 185 countries and territories through various meetings, including BMS World Mission and Global Mission. He also reached hundreds of millions more through television, videos, films, and webcasts.