Rudolf Joseph Lorenz Steiner (27 (or 25) February 1861 - 30 March 1925) was an Austrian philosopher, social reformer, architect and esotericist. Steiner gained initial recognition at the end of the nineteenth century as a literary critic and published philosophical works including The Philosophy of Freedom. At the beginning of the twentieth century he founded an esoteric spiritual movement, anthroposophy, with roots in German idealist philosophy and theosophy; other influences include Goethean science and Rosicrucianism. In the first, more philosophically oriented phase of this movement, Steiner attempted to find a synthesis between science and spirituality.

Steiner's father, Johann(es) Steiner (1829 - 1910), left a position as a gamekeeper in the service of Count Hoyos in Geras, northeast Lower Austria to marry one of the Hoyos family's housemaids, Franziska Blie (1834 Horn - 1918, Horn), a marriage for which the Count had refused his permission. Johann became a telegraph operator on the Southern Austrian Railway, and at the time of Rudolf's birth was stationed in Kraljevec in the Murakoz region of the Austrian Empire (present-day Donji Kraljevec in the Medimurje region of northernmost Croatia). In the first two years of Rudolf's life, the family moved twice, first to Modling, near Vienna, and then, through the promotion of his father to stationmaster, to Pottschach, located in the foothills of the eastern Austrian Alps in Lower Austria.  Steiner entered the village school; following a disagreement between his father and the schoolmaster, he was briefly educated at home. In 1869, when Steiner was eight years old, the family moved to the village of Neudorfl and in October 1872 Steiner proceeded from the village school there to the realschule in Wiener Neustadt.  In 1879, the family moved to Inzersdorf to enable Steiner to attend the Vienna Institute of Technology, where he studied mathematics, physics, chemistry, botany, biology, literature, and philosophy on an academic scholarship from 1879 to 1883, at the end of which time he withdrew from the institute without graduating. In 1882, one of Steiner's teachers, Karl Julius Schroer, suggested Steiner's name to Joseph Kurschner, chief editor of a new edition of Goethe's works, who asked Steiner to become the edition's natural science editor, a truly astonishing opportunity for a young student without any form of academic credentials or previous publications.  Before attending the Vienna Institute of Technology, Steiner had studied Kant, Fichte and Schelling.Answer this question using a quote from the following article:

What interesting detail of his education do I need to know about?
Before attending the Vienna Institute of Technology, Steiner had studied Kant, Fichte and Schelling.