Served as Minister for Magic during World War II, from 1939 – 1948 (Pm).
- Worked his way up from "tea-boy" in the Department of Magical Accidents and Catastrophes, which probably prepared him for the tumult of World War II.
- As Minister, he worked closely with the Muggle Prime Minister, Winston Churchill
Note the similarities of the name Leonard Spencer-Moon with his counterpart in the Muggle World, Sir Winston Leonard Spencer-Churchill. Is J.K. Rowling hinting that they are somehow related through the Spencer family, which later gave us Lady Diana Spencer, Princess of Wales, and mother of Prince William and Prince Harry?