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Breipohl studied Business Administration and Law at the Universities of Hamburg, Münster and Tübingen, and is a Doctor of Law. He completed his bank apprenticeship at Bankhaus Hermann Lampe KG. Since 1970, he served as a Member of the Management Board of Allianz Lebensversicherungs-AG, Stuttgart. Since 1985, he served as Deputy Member of the Board of Management of Allianz Versicherungs-AG, Munich and is responsible for Asset Management since 1986. Since 1990 he was responsible for Human Resources of Allianz Versicherungs-AG, Munich. From 1991 to 1999, he was responsible for Group Finance as Member of the Board of Management of Allianz AG. He has been a Member of the Supervisory Board of Allianz AG (Munich) since 2000, and a Member of the Supervisory Board of Allianz AG (Germany), since April 17, 2002.
Breipohl has been a Director of a large number of European companies. As Head of Group Finance at Allianz, Breipohl was designated by Euromoney as "Europe's biggest investor". He is an International Advisor of Goldman Sachs.
- "Óscar Fanjul Martín". Businessweek. Retrieved October 5, 2013.
- "Meet Europe's biggest investor: Diethart Breipoh, Allianz". Euromoney. Retrieved October 5, 2013.