Conversation so far:
When was Immanuel Kant born?
Immanuel Kant was born on 22 April 1724.
Where was Immanuel Kant born?
Immanuel Kant was born in Königsberg, East Prussia.
Who were Immanuel Kant's parents?
Immanuel Kant's mother was Anna Regina Reuter and his father Johann Georg Kant.
Did Immanuel Kant have any siblings?
Immanuel Kant was the fourth of nine children - four of whom reached adulthood.
Where did Immanuel Kant go to school?
Immanuel Kant first attended the Collegium Fridericianum from which he graduated at the end of the summer of 1740.
Where did Immanuel Kant attend Collegium Fridericianum?
The Collegium Fridericianum was a prestigious gymnasium in Königsberg, Prussia.

Question: what did he do after school?
Self-contained rewrite: What did Immanuel Kant do after school?