In the 1920s/30s his collaborations with Louis de Bree enjoyed great popularity. Ruys and De Bree regularly performed together as a duo in pieces such as Vicki Baum's Grand Hotel, Marcel Pagnol's Monsieur Topaze and, most notably, Potash and Perlmutter. The two also starred together in the extremely popular feature film The Cross-Patch by Henry Koster, which played in Dutch cinemas for no less than seven years and proved a commercial success in the United Kingdom as well.
