Forced to leave Lithuania by the war, Aleksandras was invited to organize drawing and sculpture departments at a new school in Kandern, in the Black Forest region of West Germany, in 1946. Soon after, he became the head of the sculpture department at the School of Applied Arts (Ecole des Arts et Metiers) in nearby Freiburg im Breisgau, where he taught both sculpting and drawing until 1949. He is credited for producing a number of Lithuanian sculptors who became very successful in the West, such as Antanas Mončys, Juozas Pivoriūnas, Vytautas Raulinaitis, Boleslovas Milaknis, Ramojus Mozoliauskas, and others. During this period, Aleksandras participated in exhibitions in Germany and his sculptures were selected to be sent to New York and Chicago on a traveling exhibition.

In 1949, Aleksandras Marciulionis with his family moved to Adelaide, Australia. Here he made a living working in zincography with an opportunity to express himself as a graphic artist. He also created watercolor paintings, created theater decorations, and participated in art exhibitions.

Early in 1956, the Marciulionis family relocated to Chicago. Aleksandras went to work at firms engaged in designing and producing sculptural decorations and monuments, and completed projects for more than a hundred churches. After work he devoted himself to his own art and his works were exhibited in the Chicago area.

In 1962, Aleksandras created an large aluminum sculpture of St. Casimir to decorate the front of the new Lithuanian church in Maspeth, New York. That same year he also designed the Lithuanian pavillion for the Chicago's International Trade Fair.

In 1978, Aleksandras Marciulionis had a major solo exhibition at the Lithuanian Art Gallery Čiurlionis and displayed his versatility with 50 sculptures in various materials, 5 watercolors and 3 drawings. When asked about his work, Aleksandras replied that he uses all types of materials, especially those that can be worked more easily, and that he likes all types of themes, especially those that come readily to mind. Lacking a studio with "monumental" space, Aleksandras created sculptures of "salon" proportions.

Aleksandras Marciulionis died in Chicago on May 12, 1998. He is buried at the St. Casimir Lithuanian cemetery.

References: exhibition programs and articles in Draugas, Lietuvos Aidas, Musu Kelias, and Naujienos.