In his early years De Roos was inspired by the Arts and Crafts Movement. An example of this can be found in his edition of Kunst en Maatschappij (Art and Society (1903)). As a supporter of Ferdinand Domela Nieuwenhuis, De Roos attempted to create the ideal of ''Art to the People``. Between 1907 and 1947 he was employed by the type foundry Amsterdam (known previously as N. Tetterode), where he further developed his lithographic skills.
Ferdinand Domela Nieuwenhuis
De Roos