Who was Luke in the bible? I have seen his name appear in 

"Luke, the beloved physician, and Demas, greet you." (Colossians 4:14).

What more do we know about the author of the book of Luke? Where did he come from? Was he a doctor?
A collection of information on him is here, some of it is kergyma (oral tradition): http://orthodoxwiki.org/Apostle_Luke

The first paragraph reads:


  The holy, glorious and all-laudable Apostle and Evangelist Luke is the
  author of the Gospel of Luke, the companion of the Apostle Paul (Phil
  1:24, 2 Tim 4:10-11), and is numbered among the Seventy Apostles. He
  was a native of Syrian Antioch and a physician, and is the founder of
  iconography.


According to tradition, he painted the first icon as we think of them, it is called 'Directress' and it is of the Theotokos (Mother of God) holding the child Christ.