In 1945, Helmut Hahn began his training with an internship as an assistant in stage and costume design at the Mönchengladbach-Rheydt municipal theaters. At this time, the first independent designs were already emerging. In 1948 he began his studies at the Düsseldorf Art Academy with Werner Heuser , Walter von Wecus and Otto Coester . On leave of absence from the academy, from 1949 he was taught print design at the textile engineering school in Krefeld by Elisabeth Kadow . A year later he switched to the Werkkunstschule Wuppertal to study writing and typography with Heinrich Wehmeier.
During his life Hahn showed a wide range of interests in different artistic media and modes of expression. His work groups include graphics (drawings, watercolors, gouaches, etchings), paintings on canvas (acrylic and oil paint), textile works, wall hangings, wallpaper designs, stage sets, commercial graphics, collages and photographs (color and black and white). This testifies to a broad spectrum of aesthetic expressions to which Hahn devoted himself in different phases of his life. Hahn always worked in series in which he developed and tried out different variations.
Although Hahn was able to fall back on a broad repertoire of creative expression possibilities, the mastery and representation of his environment in abstract forms, signs and surfaces took place mainly in the drawing. In his hatching, lines or color contrasts, abstract landscapes, fields, forests or horizons can be guessed at.