Ronald Stoyan is Senior Editor of Abenteuer Astronomie magazine, and the proprietor of the independent German publisher Oculum-Verlag, which specializes in amateur astronomy books. He has authored or co-authored twelve books on practical astronomy, including Atlas of the Messier Objects (Cambridge, 2008), The Cambridge Photographic Star Atlas (Cambridge, 2017), Atlas of Great Comets (Cambridge, 2015) and the interstellarum Deep Sky Atlas (Cambridge, 2014).