Discharged from the army in 1946, Koerner returned to Vienna to ascertain that his parents, his brother Kurt (b. 1913) and sister-in-law (Olga Körner, b. 1920), his seven aunts and uncles, and all but two of his cousins, had been deported and killed. Later research revealed that his parents had been murdered upon arrival at June 15, 1942 at Maly Trostenets, outside Minsk. Photographs taken by the artist during his April 1946 return to Vienna exhibited were exhibited posthumously in exhibitions in Vienna,
Naples, Florida and
Columbus, Ohio. In
Berlin, having joined on March 27, 1946 the Graphics Division of the
U.S. Military Government, he painted his first major works, including My Parents II (Curtis Galleries, Inc., Minneapolis),
The Skin of Our Teeth (
Sheldon Memorial Art Gallery, University of Nebraska), and Mirror of Life (
Whitney Museum of American Art, New York). These paintings were exhibited in 1947, to international acclaim, in a one-person show at Berlin's Haus am Waldsee—the first exhibition of American modern art in post-war Germany and the first and for many years the only art exhibition in Germany to reflect on the holocaust. Auschwitz had been liberated less than two years earlier, and a generation later artists would base their undertaking on the exploration of problems of historical trauma, memory, and amnesia, American art critics complained of what they perceived as Koerner's unwarranted "bitterness" and "hysterical I-told-you-so path," advising him to look forward, not back. Returning to New York later that year, Koerner exhibited the Berlin works in an exhibition at Midtown Galleries, which represented him until 1964.
Life magazine wrote of the show: "No new artist in years has been accorded the sudden, unanimous praise received by Koerner." Critics associated his work that of other so-called
Magic, (
or Symbolic) Realists such as
Paul Cadmus and
George Tooker. Koerner's art was admired by
Lincoln Kirstein, who exhibited several of the artist's paintings in the show
Symbolic Realism in American Painting, 1940-1950 at the London Institute of Contemporary Arts, organized to coincide with performances by the
New York City Ballet in London. Inspired by the structural logic of
Giotto's frescoes in the
Arena Chapel, Koerner created in 1948–49 a new series of paintings—all in the same scale and viewpoint and focused on the American scene—that absorbed fantastical elements into the fabric of everyday life. The artist took some inspiration from the handcrafted, vernacular surrealism of
Coney Island ghost rides and fun houses, which he painted as uncanny conduits to the
Prater amusement park of his childhood home in Leopoldstadt. In 1949 Koerner work received the Temple Gold Medal from the Pennsylvania Academy of Fine arts. ==Pittsburgh==