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Psychologist (University diploma)
Managing Partner of Hellge & Siebner from 1997 to 2025
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Psychologist (University diploma)
born 1956 in Berlin, married, 1 child
Studied Psychology and Philosophy at the Freie Universität Berlin and worked there as Research Associate
Managing Director of Timmermann Unternehmensberatung GmbH, Berlin
Self-employed as trainer and consultant since 1984
Managing Partner of Hellge & Siebner since 1997
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