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In 1966 Hermann began working with writer Greg on adventure feature Bernard Prince and with writer Jean-Luc Vernal on historical Jugurtha. Another feature, the western Comanche, was added in 1969.
Hermann began writing his own stories in 1977 and created the post-apocaliptic Jeremiah as both author and illustrator, which is his most extensive, longest-running and most successful creation. The feature Les Tours de Bois-Maury, set in the Middle Ages, was added in 1984. From 2000 until his death, Hermann also created many non-series graphic novels, often together with his son, Yves H..