The Mats Jonasson glassworks began as Maleras glassworks, which was founded in 1924 in Sweden. Folke Walwing began working at Maleras in 1924, and was art director until 1970. Mats Jonasson began working at Maleras in 1959. In 1969 he left to work at Kosta, coming back to Maleras in 1975. In 1965, Maleras became part of the Flygsfors group, and then joined the Royal Krona group in 1974. Kosta Boda took over in 1977, and in 1981, the employees of Maleras bought the company and ran it themselves. In 1988 Mats Jonasson took over the company and became managing director and cheif designer. The company is still in production today, under the name Mats Jonasson Maleras.
Sources: 20th Century Factory Glass by Lesley Jackson.