Dr. Luke, also known as Luke the Evangelist, is a prominent figure in the Christian tradition. He is traditionally credited as the author of the Gospel of Luke and the Acts of the Apostles, which are part of the New Testament. Dr. Luke is often depicted as a physician, highlighting his background in medicine and his compassionate nature. In Christian art, Dr. Luke is frequently represented with a winged ox or calf, symbolizing sacrifice and service. His writings emphasize the themes of mercy, healing, and the importance of the marginalized in society. He is celebrated on October 18 in the liturgical calendar.