He has been at Die Zeit since 1958, rising to Editor-in-Chief and Publisher.
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He also served as Chief of Planning Staff for the German Ministry of Defence in 1969 to 1970 and is currently and Advisory Board member for the Institute for Historical Justice and Reconciliation.
Elke Sommer | Theo van Gogh | Theo Paphitis | Theo Kelly | Theo Walcott | Theo van Doesburg | Theo Jörgensmann | Theo Altmeyer | Tim Sommer | Theo van Gogh (film director) | Theo Bleckmann | Raymond Sommer | Theo Uittenbogaard | Theo Loevendie | Theo Jørgensen | Theo Vennemann | Theo van Gogh (art dealer) | Theo Travis | Theo Maassen | Theo Kogan | Théo Kerg | Théo de Barros | Theo Bos | Theo | Robert Sommer | David Theo Goldberg | Alfred Sommer (ophthalmologist) | Vincent & Theo | Tom Theo Klemesrud | Theo Waigel |
Theo Sommer, then publisher of Die Zeit, was one of the first to use the term 'German core culture', as part of a debate about the assimilation of immigrants in Germany, and national core values: "Integration necessarily implies a far-reaching assimilation onto the German guiding culture and its core values" („Der Kopf zählt, nicht das Tuch“, Zeit 30/1998).