Born in 1889 as a son of a Jewish lawyer. He studied art at the Academy of Art in Vienna and was soon fascinated by the French modernist movements of that time.

He was fortunate to move to Paris and continued his art studies at the Académie de la Grande Chaumière. At the beginning of the war, Eisenschitz decided to move back to Austria, but was arrested and put in an internment camp close to Angers in France. His wife Claire Bertrand followed him and in 1915 and 1916 their two children were born in the camp. After the end of the war, the family moved to Switzerland to Lucerne, as Eisenschitz suffered from severe tuberculosis. A few paintings still exist from that time, different in style and subject than his later style back in France. In 1920 the family moved back to Paris and lived then in Provence. He held exhibitions in the United States, South America, England and throughout France, exhibiting in renowned Parisian art galleries.