1913-23 Hindenburgschool Düsseldorf thereafter Protestant Pädagogikum-Bonn.

1923-26 Studies at the Düsseldorf’ Academy of Arts under Heinrich Nauen, Johan Thorn-Prikker und     Karl Ederer.

1926-28 Studies in Paris at the Academie de la Grande Chaumiere

1928-30 Peter Janssen lives as independent artist in Düsseldorf.

1935 Exclusion from the Reichskammer der bildenden Künste. He is prohibited to paint and have exhibitions. Stay in Spain.

1936 Stay in Italy

1937 Stay in United States of Amerika

1938 First personal exhibition at Alfred Flechtheim

1938-39 Stay in England

1940 Military service in Leipzig

1941-44 Illegal stay in Berlin, Baden-Baden, the Eifel and Robertville (Belgium).

1944 On 1 1. November Peter Janssen is arrested and is deported to the labour camp Lönnewitz.

1945 Escape from the concentration camp and hiding in Düsseldorf.

1945/46 Cofounder of the Gallery Hella Nebelung and first personal exhibition after the war.

1952 Awarded the Cornelius-Price of the city of Düsseldorf.

1957 Appointed teacher at the Academy of Fine Arts in Berlin

1971 Peter Janssen is awarded the title “Professor” and lives as independent artist in Berlin.

1979 Peter Janssen dies in Berlin.