Since his studies in Vienna (Academy of Fine Arts, Prof. Anton Lehmden), Schuler has been fascinated by human physiognomy. Countless portraits have been created over the years. In addition to well-known artists such as Herbert von Karajan and Jose Feliciano, Schuler portrayed philosophers Sir Karl Popper, Viktor Frankl, Erwin Ringel, writers A. Solzhenitsyn, Lew Kopelev, Norman Mailer, the Dalai Lama, Prince Franz Josef II of Liechtenstein, personalities from politics and business such as Margret Thatcher, Federal President Rudolph Kirchschläger, Prime Minister Takeo Fukuda/Japan uva.