He's the professor of symbology who is the protagonist of "The Da Vinci Code" & "Angels & Demons"
It is the sequel to the 2006 film The Da Vinci Code, 
also directed by Howard, .... Tom Hanks as Robert Langdon, a Harvard University 
professor of symbology... [DOC] [TLE] Angels & Demons Dan Brown Introduction Angels & Demons is a ... [PAR] The novel mentions the character Robert Langdon (professor of symbology at 
Harvard), who also appears in two next Brown's novels The Da Vinci Code and 
The Lost Symbol.