John Langdon (typographer) Langdon is known mostly through his association with Dan Brown, and the novels "Angels & Demons", "The Da Vinci Code," "The Lost Symbol, Inferno, and Origin". The protagonist of these novels was named Robert Langdon as a tribute to John Langdon, and he will continue to be so for his next 12 books, an estimate given by Dan Brown himself. Langdon is now a professor of typography and corporate identity at Drexel University in Philadelphia. He continues to do work on ambigrams, as well and fine art works that incorporate language, type, and philosophy. Langdon credits his paternal grandparents for
Robert Langdon (film series) foil a deadly global plot. Following the worldwide successes of "The Da Vinci Code" in 2006 and "Angels & Demons" in 2009, which were both based on Brown's novels, starring Tom Hanks as Robert Langdon and produced and directed by Ron Howard, Columbia Pictures began production on a film adaptation of "The Lost Symbol". Hanks and Howard were expected to return for the film adaptation of "The Lost Symbol", along with the franchise's producers Brian Grazer and John Calley. Sony Pictures eventually hired three screenwriters for the project, beginning with Steven Knight and then hiring Brown himself. In March 2012,