Resident of Vienna with his wife, of neither of whom anything is known.

Dodi and Wilhelm Schenker were in regular touch with the Gruebers during 1917–19, using them as intermediaries in conveying foodstuff parcels and other items to Heinrich Schenker and Jeanette, in the course of which Heinrich and Jeanette visited the Gruebers several times (no address given).

In December 1919, Heinrich (following his marriage to Jeanette) approached Herr Grueber in his search for an apartment to rent; Grueber replied that he had nothing at the time.

In 1924 and 1925 Herr Grueber was involved in financial dealings with Wilhelm.

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