John Langdon (typographer)
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John Langdon is an American graphic artist. Langdon received his bachelor's degree in English from Dickinson College. He is known for his work developing ambigrams. He is known mostly through his association with Dan Brown, and the novels The Da Vinci Code and Angels and Demons. The protagonist of these novels was named Robert Langdon as a tribute to John. John worked as a commercial logo designer through the 1980's in Philadelphia and New York City. He is now a professor of typography and corporate identity at Drexel University in Philadelphia. He continues to do work on ambigrams, as well as paintings and fine arts works that incorporate language, type and philosophy.
Langdon is also the author of the 2005 book Wordplay: The Philosophy, Art, and Science of Ambigrams (ISBN 0-7679-2075-9) which contains a foreword by Dan Brown.