Conversation so far:
Where did Rudolf Steiner grow up?
In the first two years of Rudolf Steiner's life, the family moved twice, first to Mödling, near Vienna, and then the foothills of the eastern Austrian Alps in Lower Austria.
Why did Rudolf Steiner's family move to the foothills of the eastern Austrian Alps?
Rudolf Steiner's family moved through the promotion of his father to stationmaster to Pottshach, located in the foothills of the eastern Austrian Alps in Lower Austria.
Who was Rudolf Steiner's father?
Rudolf Steiner's father was Johann(es) Steiner.
What did Rudolf Steiner's father, Johann Steiner do?
Johann Steiner became a telegraph operator on the Southern Austrian Railway.
Who was Rudolf Steiner's mother who married to Johann Steiner?
Johan Steiner, 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
Where did Rudolf Steiner go to school when living in Pottshach?
Rudolf Steiner entered the village school, but following a disagreement between his father and the schoolmaster, he was briefly educated at home.
Did Rudolf Steiner ever return to normal school after being briefly educated at home?
Rudolf Steiner's family moved to the village of Neudörfl and in October 1872, Rudolf Steiner proceeded from the village school there to the realschule in Wiener Neustadt.. 2
Did Rudolf Steiner go to college?
In 1879, Rudolf Steiner's family moved to Inzersdorf to enable Rudolf Steiner to attend the Vienna Institute of Technology

Question: what did he study?
Self-contained rewrite: What did Rudolf study at Vienna Institute of Technology?