Lion van Leeuwen was a son of Michel van Leeuwen and Marianna Prins. He married 26 August 1936 in Amsterdam to Regina Voorzanger, a daughter of Jacob Voorzanger and Dientje Brilleslijper.
City Archive of Amsterdam, archive card of Lion van Leeuwen and Jacob Voorzanger.
According to a list with shops of Jewish owners, compiled by the Amsterdam police in 1940, Lion van Leeuwen had a hairdresser's shop, address: Transvaalstraat 142 in Amsterdam.
Abstracts of the police archives which are currently at the Amsterdam municipal archives.