He subsequently busied himself breeding racehorses in Poland and teaching singing in Paris and Nice on the French Riviera. His pupils came from a variety of countries and included Bidu Sayão, Bessie Abott, Louise Edvina, Claire Croiza, Willy Niering (possibly identical with Maurice Renaud; he took lessons with Jean de Reszke in Paris and met there Leo Slezak; Niering told Felix Rolke that they had to pay tickets in gold coins from de Reszke which were cancelled by the servant at the beginning of each lesson), Arthur Endrèze, Vladimir Rosing, Mafalda Salvatini, Clive Carey, Maggie Teyte, Miriam Licette, Edna de Lima, and Isabel Stevens Lathrop. The already well established Austrian tenor Leo Slezak also took lessons from Reszke in 1908–1909, seeking advice on how to further improve his vocal technique.