Voldemort's first job

Dumbledore reveals what Tom Riddle did when he left Hogwarts

Extract from Harry Potter and the Half-Blood Prince

by J.K. Rowling

'He reached the seventh year of his schooling with, as you might have expected, top grades in every examination he had taken. All around him, his classmates were deciding which jobs they were to pursue once they had left Hogwarts. Nearly everybody expected spectacular things from Tom Riddle, prefect, Head Boy, winner of the Special Award for Services to the School. I know that several teachers, Professor Slughorn amongst them, suggested that he join the Ministry of Magic, offered to set up appointments, put him in touch with useful contacts. He refused all offers. The next thing the staff knew, Voldemort was working at Borgin and Burkes.’

‘At Borgin and Burkes?’ Harry repeated, stunned.

‘At Borgin and Burkes,’ repeated Dumbledore calmly.

Harry Potter and the Half-Blood Prince

By J.K. Rowling