Conversation so far:
Where did Lumumba grow up?
Onalua in the Katakokombe region of the Kasai province of the Belgian Congo.
Did he have siblings?
He had three brothers (Ian Clark, Emile Kalema, and Louis Onema Pene Lumumba) and one half-brother (Tolenga Jean).
What did he go to school for?
he was educated at a Protestant primary school, a Catholic missionary school, and finally the government post office training school.

Question: What was his first job?
Self-contained rewrite: What was Patrice Lumumba's first job?