Jens Fager had studied carpentry but worked as a chef when he decided to start study industrial and product design at Tohoku University of Art & Design in Sendai, Japan before continuing at Konstfack University of Arts, Crafts, and Design in Stockholm, where he took his master’s in industrial design in 2008. In the year of leaving Konstfack, Fager founded his own design studio and was chosen as Designer of the Year by Residence magazine.
Fager's degree project was the collection Raw consisting of an armchair, a small table and a candle holder made of roughly sawed and painted wood, specially made for the Julita tavern in Sörmland. Raw was shown at the young designers Green House exhibition at Stockholm Furniture and Light Fair in 2009 and at the Salone Satellite in Milan the same year. Raw was put into production by Danish company Muuto (owned by the US company Knoll) and got a great international recognition (the French star architect and designer Philipe Starck used the chair in one of his hotel interiors). A yellow chair from the Raw-range is a part of the collection at the Röhsska Museum in Gothenburg.
In 2020 Fager was appointed to design a stool for the re-opening of the Swedish National Museum of Fine Arts in Stockholm. The result was Arc Stool made by Edsbyn Woodshop. The stool is now a part of the collection of the Museum of Furniture Studies.
Together with designer Andreas Engesvik, Fager has designed the furniture scheme Ease, again for Edsbyn. For Zero lighting company Jens Fager has designed several lamps such as Pistill and Convex. He has also worked with Stelton, Petite Friture, Rig-Tig and Absolut Vodka.
Jens Fager has participated in exhibitions in Toronto, London, Eindhoven and Milan. He has made several interior architectural projects for among other Handelsbanken in Stockholm.