Alfred de Leeuw, a wholesale meat dealer, was a witness at the wedding of his daughter Elise Roosjen de Leeuw to Jacob Samuel de Lange. The marriage was performed at Westerbork transit camp on 6 October 1942. Alfred de Leeuw signed the marriage certificate.
Record of marriage certificates of the Westerbork Municipality, currently at the archives of the Gemeente Midden-Drenthe in Beilen