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 of ambigrams. An example of Langdon's ambigrams appeared on the cover of the first edition of Brown’s novel "Angels & Demons", and other ambigrams featured throughout that novel were also designed by Langdon. On the acknowledgments page, Brown calls Langdon "one of the most ingenious and gifted artists alive … who rose brilliantly to my impossible challenge and created the ambigrams for this novel". John Langdon also created the logo for the fictitious Depository Bank of Zurich, which appears in "The Da Vinci Code" film. In an interview, Brown said that Joseph Campbell was an inspiration for the character of