Malmberg subsequently went freelance in 1949, and his work appeared in Carl Adam Nycop's
Se magazine 1949–1958 including reportage on the
Korean War in 1950 totalling about fifty pages over eight issues; in
Vi from 1958 and through the 1960s; and in
Stockholms-Tidningen. Also during that decade he developed trick techniques for still images for the 1962 Swedish sci-fi film
Nils Holgerssons underbara resa ''('Adventures of Nils Holgersson''') based on Selma Lagerlöf's novel, his material being also published in book form. He also covered the USA, Korea, Suez, Egypt, Iran, Cuba and various countries in Europe, later also from Africa and Southeast Asia, developing a subjective language with a human warmth and solidarity.
Tio Fotografer With Sten Didrik Bellander (1921–2001), Harry Dittmar, Sven Gillsäter (1921–2001),
Rune Hassner(1928–2003),
Georg Oddner(1923–2007), Lennart Olson (1925–2010),
Hans Hammarskiöld (1925–2012), Tore Johnson, and
Pål Nils Nilsson, he was a member of the professional collective
Tio Fotografer ('Ten photographers') formed in 1958 and their subsequent photo agency
Tiofoto. The group was influential in Swedish photography and they regularly exhibited at significant venues, and together showed in a retrospective at the
Hasselblad Centre in 1998. Malmberg became the group's archivist. At this time, he also took a great interest in the organization and building up of the activities of the photography collective Ten Photographers.
Portraitist Malmberg made portraits of
Charlie Chaplin in Switzerland,
George Bernard Shaw in England, and
Ernest Hemingway in Havana, Cuba.
Recognition Malmberg was twenty-seven when curator
Edward Steichen selected his photograph of a Swedish bride, backlit by low sunlight and being greeted by her groom at the door of the chapel, for the
Museum of Modern Art's 1955 world-touring exhibition
The Family of Man seen by 10 million visitors, and in its catalogue. == Publications ==