From 1993 to 1995 he worked in a financial planning company in Bamberg, 1995–1996 in the Graf-Stauffenberg-secondary school. Since 1996 he has been working as a teacher in various private schools in Bamberg.
After a first book published in 1996 Dassler has been working regularly since 2003 as a writer of non-fiction books and magazine articles dealing with issues such as business, education and information technology.
Schlüsselqualifikationen für Auszubildende. Übungen und Trainingsbeispiele, Igel Verlag, Hamburg 2009, ISBN978-3-86815-141-1
Sozialkunde FOS/BOS. Band 3: Gesellschaftliche Strukturen und Prozesse als Grundlage der Politik, Bildungsverlag EINS, Troisdorf 2009, ISBN978-3-427-08007-7