Seifert graduated from the technical high school in Rastatt in 1988. At the University of Duisburg-Essen, he studied Communication studies, Marketing and Sociology from 1991 to 1995. From 1995 to 1998, Seifert worked for MGM MediaGruppe München, where he rose to head of product management. From 1998 to 2000, Seifert was Director of Marketing in Central Europe for MTV Networks. From 2000 to 2005, Seifert was Member of the Board of KarstadtQuelle New Media AG; and CEO there from 2004.
