London was born and raised on the Upper West Side of Manhattan, New York City. A math prodigy at age five, London was on the radio show Quiz Kids, and was educated at the experimental elementary school at Hunter College, New York City.
Growing up in Manhattan's Upper West Side of New York City, London was a gifted mathematician from a young age. He participated in the quiz show "Quiz Kids" and attended a unique elementary school at Hunter College in New York City.