After his release in 1945 and with Poland falling under Soviet rule, Loza moved to Paris, France, where he was ultimately granted French citizenship. He studied art at l’Ecole Nationale Superieure des Beaux-Arts under Professor Narbonne along with classmate and well-known painter Bernard Buffet. After his graduation he resumed his studies focusing on woodcuts under Professor Konstanty Brandel and made his living painting silk scarves for some of the leading fashion houses of Paris.
In 1956, while working and living in Paris, Loza married Yvette Jourdan, a French woman he had met while vacationing in Sicily, Italy. They had one son before immigrating to the United States in 1960. Loza settled in Chicago with his new family and he and his wife welcomed a daughter shortly thereafter. In Chicago, Loza worked as a commercial artist for a local advertising firm while continuing his passion for creating fine art.
Loza's works included many oil paintings but he also used watercolors, tempura, gouache, pen, pencil, woodcuts, and other methods, with black and white scratchboards being one of his most notable techniques. In many of his compositions, Loza continued to focus on painting portraits in which psychological and dramatic effects were under-toned. He also painted landscapes, still lifes, abstracts, and figures in which blues and green predominated.
After retiring and moving to his small Kempton, IL home in the early 1980's, Loza continued to focus on his artwork, including his scratchboard portraits. Making precise razor cuts into ink-covered boards, he created stark, black and white images that became his trademark. Loza continued his passion for art until his death in 1988.
During his lifetime, Roman Loza participated in many art shows in France, Germany, Italy (Sicily), and the U.S.A. including several "One Man" shows, and had been awarded several prizes and distinctions. Roman Loza was a member of the Syndicat National des Peintres Illustrateurs (Paris, France), The Association of Polish Artists in Paris, Les Amis des Arts de Saint-Maur (France), and the Polish Arts Club of Chicago (Illinois).