Ronald Stoyan is Editor-in-Chief of interstellarum, and the proprietor of the independent German publisher Oculum-Verlag, which specializes in amateur astronomy books. He is the founding director of the German deep sky organization 'Fachgruppe Deep Sky' and has authored or co-authored twelve books on practical astronomy, including Atlas of the Messier Objects, The Cambridge Photographic Star Atlas and the Atlas of Great Comets. Stephan Schurig is a web and graphics design expert. Being an observer himself, he understands the specific needs of celestial cartography and its presentation. He is co-author of Germany's most popular planisphere, and is the designing author of a unique annual poster showing events in the night sky.