Rolf (Berlin, Germany) lives in Berlin and is sketching from observation as a passion since his youth, while currently drawing for stone-design, architecture and bits of illustration for the living. After an apprenticeship as stonemason he achieved an architecture degree at the RWTH Aachen. While studying there he was teaching observational drawing as a student assistant at the architecture department. He joined USk in 2009 and co-founded the berlin.USk-blog in 2011. Since this time sketching more and more became the grout, that fills most gaps in his everyday live. Rolf regularly sketches with a group of children and does workshops on local or national USk-meetings.