Jack Ränge studied during the 1940s at Konstfack University of Arts, Crafts and Design and later architecture at the Royal Institute of Technology, both in Stockholm. In 1950 Ränge founded his own design studio from where he mainly worked as an interior architect on several major public spaces, offices, and restaurants.
In 1952, Ränge designed the camp chair Känguru that was shown at the exhibit of 52 chairs 52 at the Röhsska Museum of Craft and Design in Gothenburg the same year. In 1961 a new model of the chair was released by Nässjö Stolfabrik, under the international name Kangaroo. Ränges was an enthusiastic sailor, and with Kangaroo he wanted to incorporate the sailing life into furniture. The camp chair got its name from the foldable stool that came with it. When the chair was folded and placed against a wall, the canvas folded like a pouch where the stool could be lodged, like a kangaroo baby.
In the following year, 1962, Ränge created the bentwood armchair Kaiser for Gemla, which was so liked by the emperor of Japan, Hirohito that he furnished his breakfast room with it. During the 1960s and 70s, Ränge was the leading designer at Klaessons Möbler, for whom he created a large number of chairs aimed for public buildings. The most prolific is the KS 251 chair which was produced in over 100 thousand copies.
During the beginning of the 1990s, Ränge designed the chairs Tranan, Viggen, and Vipan for the Swedish manufacturer Albin i Hyssna. Jack Ränge died in 2011, at the age of 94.
