In 1897 he became ambassador extraordinary and plenipotentiary to the United States. The German Emperor William wanted the two countries to be closer aligned. Together with Secretary John Hay, of the State Department, von Holleben had charge of the arrangements for the official visit of the emperor's brother, Admiral Prince Henry of Prussia, in February 1902. The visit was regarded favourably, but did not lead to any lasting change in relations between the two countries. There were reports that the emperor and establishment in Berlin were impatient with von Holleben, believing him to have misled them on the American attitudes to a closer relationship.[1] Failing health together with his inability to have President Roosevelt arbitrate the German-Venezuelan dispute caused von Holleben′s resignation in January 1903, and he was succeeded by Baron Hermann Speck von Sternburg.
While serving in the US, von Holleben received an Honorary doctorate (LL.D.) from Harvard University in June 1901.[2] After the visit to the United States of Prince Henry of Prussia in March 1902, the Emperor conferred upon von Holleben the Order of the Red Eagle, first class with Oak leaves.[3]
Knight of the Order of the Red Eagle, 4th Class, 18 January 1879;[5] 2nd Class with Oak Leaves, 18 January 1891; with Crown, 16 September 1893;[6] 1st Class with Oak leaves, March 1902[3]