Robert Langdon Robert Langdon Professor Robert Langdon is a fictional character created by author Dan Brown for his "Robert Langdon" book series: "Angels & Demons" (2000), "The Da Vinci Code" (2003), "The Lost Symbol" (2009), "Inferno" (2013) and "Origin" (2017). He is a Harvard University professor of history of art and "symbology" (a fictional field related to the study of historic symbols, which is not methodologically connected to the actual discipline of semiotics). Tom Hanks portrays Langdon in the "Robert Langdon" film series, starting with the 2006 film adaptation of "The Da Vinci Code", reprising the role in the 2009 film adaptation
Dr. Priestley Dr. Priestley Dr. Lancelot Priestley is a fictional investigator born in July 1869 in a series of books by John Rhode After 1924 Dr. Priestley took over from Dr. Thorndyke as the leading fictional forensic investigator in Britain, and featured in 72 novels written over 40 years, solving many ingenious and misleading murders. Dr Priestley's involvement is usually at the request of the police but only if the case piques his scientific curiosity; having little, or no, interest in criminal justice. ""Hanslet had brought many problems which confronted him in the course of his duties to Dr. Priestley's notice, usually