He then studied graphic design and advertising at the Market Communication Program IHR from 1957 to 1958.

[2] He cocreated the Swedish children's program Pellepennan and Suddagumman together with Gunnel Linde.

Löfgren both wrote and illustrated children's books, which were translated into twenty languages.

Löfgren's works can be found in institutions such as the National Museum of Fine Arts in Stockholm.

[3] 1960 – Elsa Beskow plaque[4] Plaques at the Biennal of Illustrations, Bratislava 1971, 1973, and 1975 Grand Prix, Biennal of Illustrations in Bratislava 1977 (for the book "Harlequin") 1991 – Knut V. Pettersson scholarship