The design duo is made up of Mattias Karlsson and Erik Björk. Mattias was born 1979 in Norrköping, Sweden and Erik was born in 1978 in Stockholm, Sweden. They run their own company Karlsson & Björk.

For NC Karlsson & Björk have designed the table series KNOP.

Besides NC Karlsson & Björk have worked with Gemla Fabrikers and S-line. They have done the interior for The Royal Institute of Art in Stockholm and Cnema Norrköping. They have also been guest lecturers at Carl Malmsten Furniture Studies och at Nyckelviksskolan. They have exhibited at Artipelag in 2013, at Liljevachs in 2012 and at Röhsska museet in 2009.

They have also received several scholarships, such as Innovativ kultur 2013, The Scandinavian-Japan Saskawa Foundation, Estrid Ericsons stiftelse 2009, Siw and Carl Malmstens Minnesfond, Bo Edblad och Maureen Wells Stipendiefond, Asahikawa International Furniture Design Competiton, Bronze Leaf 2008 as well as Norrköpings kommuns kulturstipendium 2006.