Dr. Glen Kallenbach, who had a medical practice in Mexico from 1946 until his retirement in 1984, is celebrating his 100th birthday today. At the time of his retirement he was in practice longer than any other physician who was in practice at that time and was dubbed "dean of Mexico physicians." It has been reported he delivered more than 3,500 babies during his years of practice. In 2003, Dr. Kallenbach wrote a book about his life and career as a physician. Dr. Kallenbach, who was born in Tuscumbia, is a resident of Missouri Veterans' Home-Mexico.