In 1925 Weiss met Jaroslav Havlíček, with whom he shared rather fine contacts until the latter's death in 1943.
Jan van Eyck | Jan Matejko Academy of Fine Arts | Jan Hammer | Jan Peerce | Jan Hus | Jan Mayen | Jan Guillou | Jan Smuts | Jan Fabre | Jan Morris | Jan Matejko | Jan Garbarek | Ignacy Jan Paderewski | Jan van Riebeeck | Jan Troell | Peter Weiss | Jan Tinbergen | Jan Neruda | Jan-Michael Vincent | Jan Kochanowski | Jan Brewer | Jan Bechtum | Jack Weiss | Jan Zamoyski | Jan Ullrich | Jan Peter Balkenende | Jan Egeland | Bill Weiss | Robert Jan Stips | Paul, Weiss, Rifkind, Wharton & Garrison |
He wrote with Edmund Reitter and Ján Weiss Catalogus coleopterorum Europae, Caucasi et Armeniae rossicae.