He returned to Europe and continued his studies in Berlin, Munich and Paris.
[1] He was one of a dozen sculptors invited to compete in the Pioneer Woman statue competition in 1927,[2] which he failed to win.
[3] He was elected into the National Academy of Design in 1937 as an Associate member and became a full Academician in 1944.
As a medalist Korbel designed a medal struck by the Medallic Art Company New York about Nazi Germany occupying Bohemia and Moravia.
[4] That medal was available at the unfinished pavilion of Czechoslovakia of the 1939 New York World's Fair as an award for contributions to the Czech Resistance.