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.

Question: what did his father do?
Self-contained rewrite: What did Rudolf Steiner's father, Johann Steiner do?