In April 1934 Rosenborg was one of 1,500 artists to participate in the annual Salons of America exhibition, which was held that year in
Rockefeller Center's
RCA Building. Each paid two dollars for the privilege of hanging up to three works and none was given prominence over the others. The
New York Times reported that by the time the show closed a month later, some 30,000 people had viewed it. The following year he was given a solo exhibition (his first) at the Lounge Gallery of the
Eighth Street Playhouse. The year after that he participated in a group show held by the Municipal Art Committee and in 1937 was given a second solo exhibition, this time in the Artists Gallery, which, like the Lounge Gallery, specialized in shows of deserving young artists who were unable to show in New York's commercial galleries. That year he also became a founding member of and participated in a group show held by
American Abstract Artists, a loose assembly of artists that aimed to promote abstract art and artists in New York. At roughly the same time Rosenborg associated himself with a group of abstractionists that called itself "
The Ten" and in May 1938 joined with its other members in what would be his first appearance in a commercial gallery: the Gallery Georgette Passedoit. In 1938 he his work appeared in a group show at the Lounge Gallery, in 1939 in group shows at the Artists Gallery and (with other members of The Ten) at the Bonestell Gallery, and in 1940 yet another group show (with other members of
American Abstract Artists) at the
American Fine Arts Building. During this period Rosenborg began an association with an art dealer, Marian Guthrie Willard, that would last into the war years. Willard was known for selecting artists whose work she admired without regard to their commercial potential. She aimed to nurture the careers of young artists whose work, as she put it, made "a personal statement as well as a vision of the universal." In 1938 Rosenborg's paintings were included in group shows at her East River Gallery, in 1939 at a gallery she ran jointly with J.B Neumann called the Neumann-Willard Gallery, in 1942 at the
Willard Gallery, and in 1943 at the same place. Willard gave Rosenborg solo shows in February and November 1941. Rosenborg never had an exclusive long-term relationship with a commercial gallery. Throughout his career his work appeared in both group and solo shows in a wide variety of galleries and museums both in New York and elsewhere in the United States. Examples include the
Phillips Memorial Gallery (group, 1941),
Yale University Art Gallery (group, 1942), Brandt (group, 1944), the Pinacotheca (solo, 1945), Troeger-Phillips (solo, 1946), Chinese Gallery (solos, 1946 and 1947),
Art Institute of Chicago (group, 1948),
Corcoran Gallery of Art (groups, 1949 and 1959) Seligmann (solo, 1950), Davis (solos, 1953 and 1954), Delacorte (solo, 1955), and Landry (solo, 1959, 1960, and 1962). He contributed paintings to exhibitions at the
Whitney Museum of American Art in 1946, 1953, 1956, 1957, 1976, and 1990. He was given retrospective exhibitions in 1982 at the Schlesinger-Boisanté Gallery and in 1983 at the
Princeton Gallery of Fine Art.
Artistic style and critical reception Unlike better-known abstract expressionists, Rosenborg made small paintings and gave preference to gouaches and watercolors over oils. From his mentor, Henriette Reiss, he had learned a style of abstraction that involved symbolic interpretation of natural rhythms. Critics noted a preference for a gestural abstraction rather than a geometrical one. They also saw a persistent use of symbols, noting a similarity to the work of
Wassily Kandinsky and
Paul Klee. Throughout his career critics further saw a distinct lyricism in Rosenborg's work. Rosenborg's 1937 watercolor, "Abstracts in Blues and Greens" (at left above) illustrates his early watercolor style. "The Far-away City" of 1941 (at right above) illustrates his early style in oils. "American Landscape" (at left above) illustrates his late style in oils. "Landscape with Pink, Green, and Blue" (at right above) illustrates his late watercolor style. His early work obscured the natural forms that inspired them making critics see them as tending toward pure abstraction. In the early 1950s he made a transition to a more clearly figurative expression. These late works were said to give off an air of mystery. Writing of a solo show held at the Landry Gallery in October 1960, Stuart Preston of the
New York Times said, "The essence of mystery and magic is exactly what distinguishes Ralph Rosenborg's meditative semi-abstract landscape water-colors... These are rapturous little acts of visual and manual concentration at first sight inscrutable and then revealing themselves to be precise and allusive. Writing about the same show, Bennett Schiff, critic for the
New York Post, said "A mystical intensity and a beauty which burns in ruby and sapphire colors are in these fine paintings." ==Personal life and family==