Rosemarie Eitzert, born Rosemarie Schach von Wittenau, is best known under her pen name Tina Caspari. For her writings she has also used the pen name Claudia Jonas and her birth name Rosemarie von Schach. She has moreover worked as a translator and has written several commissioned books for the German Schneider Verlag that were published under the name of Enid Blyton, e.g. books 7 to 18 of the German "Dolly" series and books 4 to 14 of the German "Tina und Tini" series