 Also in 1997 he founded with Marek Vogel the photography forum "glossy" in Munich, that he is still running together with Martin Fengel.The main focus of his works is on photojournalism and travel photography.In addition to a lot of fine art photographs and works for print media, Koopmann got popular by his works in magazines like 
the "ZEIT-Magazine" of Die Zeit, the "SZ-Magazine" of the Süddeutsche Zeitung, the Swiss Tages-Anzeiger, Wallpaper+Line (London), Spex and others.