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Diethelm Keller Holding A family company Diethelm Keller Holding is a closely held family company, principally owned by fourth generation descendants of the founders. Its primary function is to set the overall long-term strategy, to determine the balance of risk exposure and to set the long-term goals of the four operating units.
Diethelm Keller Holding, with headquarters in Zurich (Switzerland), holds four operating units:
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Diethelm Keller Holding A family company
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Milestones of the Group
Around 1870, two young Swiss pioneers, Wilhelm Heinrich Diethelm and Edward Anton Keller, ventured to the Far East.

