**Klaus Schmeh (@KlausSchmeh) (schmeh.org)** is the most-published cryptology author in the world. He has written 15 books (in German) about the subject, as well as over 250 articles, 25 scientific papers, and 1500 blog posts. Klaus’s main fields of interest are codebreaking and the history of encryption. His blog *Cipherbrain* is read by crypto enthusiasts all over the world. Klaus is a popular speaker, known for his entertaining presentation style involving self-drawn cartoons and Lego models. He has lectured at hundreds of conferences, including the NSA Cryptologic History Symposium, HistoCrypt, the Charlotte International Cryptologic Symposium, and the RSA Conference in San Francisco. In his day job, Klaus works for an IT security company. With co-author Elonka Dunin, he recently published the book *Codebreaking: A Practical Guide*, as well as an article in the academic journal *Cryptologia* on hill climbing techniques, entitled, “How We Set New World Records in Breaking Playfair Ciphertexts.”