Baedeker to have three of his four sons − Hans, Ernst and Dietrich − beside him in the firm, as editors and writers. Karl Baedeker III, the fourth son, entered academia and rose to become a professor of physics at the University of Jena. He was killed in action at the Battle of Liège in August 1914. It was his son Karl Friedrich who revived Verlag Karl Baedeker after the Second World War. During his reign, which lasted over 50 years, Fritz produced 73 new "Baedekers", as they came to be known universally. The Baedeker travel guides became so popular that
Baedeker by Ernest Benn. His brother joined him in the venture shortly afterwards. Hermann Augustine Piehler (1888−1987)—better known as H.A. Piehler in the publishing world—was an Englishman of German descent who became the chief editor of the English editions after the Muirheads left. During his student days, Karl Friedrich Baedeker had spent a year in England and had lived with Piehler at his London residence. In 1948, when Karl Friedrich decided to re-establish the Baedeker firm in Malente (British zone, in Germany), his publishing licence was endorsed by Piehler, who was then a colonel in British Intelligence and the head of