Robert Langdon is a fictional Harvard University professor of religious iconology and symbology (a fictional field related to the study of historic symbols, which is not methodologically connected to the actual discipline of Semiotics). The character was created by author Dan Brown for the novels and later movies, Angels & Demons (2000), The Da Vinci Code (2003) and The Lost Symbol (2009).
Tom Hanks portrayed Robert Langdon in the 2006 film adaptation of The Da Vinci Code, reprised the role in the 2009 film adaptation of Angels & Demons, and will play the role again in the 2012 film adaptation of The Lost Symbol.
Read more about Robert Langdon: Character Development, Storyline, Bibliography