Baron's father was Barnett Bernstein, a Polish-Jewish immigrant to Britain who settled in the East End of London in 1908 and later worked as a master furrier. Baron was born in Maidenhead, where his mother Fanny (née Levinson) had been evacuated during Zeppelin raids. The family soon returned to London, and Baron was raised in the Hackney district of London. He attended Hackney Downs School.
