After learning to paint in Altdorf, Uri, Schiess worked in Lucerne and in 1920 took a study trip to Italy to further refine his artistry.
In 1923, Schiess began serving with the Pontifical Swiss Guard at Vatican City and continued his education here until 1927.
During his time in Italy, Schiess was introduced to famous painter Philip de László, and in 1928 the two artists travelled throughout the world to destinations including Africa, America, Spain and France.
In 1933, Schiess returned to Italy and again began to serve with the Swiss Guard, a position in which he remained until 1951.
Schiess also enjoyed recreating the works of old masters, which brought him great recognition for his skills.