From 1973 to 1979 he studied at the Kunstakademie Düsseldorf, with Lambert Maria Wintersberger, Gerhard Richter and Karl Otto Götz.
1975 he lived 1 year in a mountain shelter in the Toscana where he painted landscapes and portraits and grappled intensely with the effect of colours.
After that Gläsker worked alone in an abandoned room, belonging to the suspended professor Joseph Beuys, who had been dismissed without notice by Johannes Rau, the minister of science at that time, because he indiscriminately admitted all people who applied to the academy.
[1] Later Gläsker became master student of Karl Otto Götz (professor of Sigmar Polke, Franz Erhard Walther and others).
The art theorist and curator Manfred Schneckenburger named Gläsker, in relation to his carpet and wallpaper paintings, the European founder of the Pattern Art and wrote that he developed his own particular new, idea of the ornament, “as if the hard verdict of Adolf Loos “ornament is a crime” had never existed".