Katsura Tarō
Nakajima initially entered Meiji University, but left without graduating, and obtained a degree from the Higher Commercial School (the predecessor to Hitotsubashi University) in 1897, obtaining a position at the Tokyo Stock Exchange on graduation. In 1899, he became secretary to Prime Minister Katsura Tarō and in 1906 served as secretary to Prime Minister Saionji Kinmochi.