After attending school, Rosengarten did an apprenticeship as a locksmith , which he completed in 1954 with the journeyman's examination. He then worked as a locksmith and electric welder for around twenty years . Later, after completing a preparatory course, he attended the technical college for mechanical engineering in Berlin-Lichtenberg and graduated with a degree in technology in mechanical engineering. He then worked as chief technologist, production director and safety engineer before taking early retirement in 1992.
Rosengarten joined the CDU in 1990, where he soon took over the post of deputy district chairman and delegate in the state committee and state party conference. From 1990 to 1995 he was a member of the district assembly in Lichtenberg , in which he was first chairman of the CDU parliamentary group and then deputy head of the BVV. In 1995 he was elected to the Berlin House of Representatives for the first time , to which he belonged until 2001.
|BRIEF DESCRIPTION||German politician (CDU)|
|DATE OF BIRTH||September 30, 1936|
|PLACE OF BIRTH||Berlin|
|DATE OF DEATH||January 28, 2007|