As a graphic designer, Joep Pohlen has his own design company Polka Design in The Netherlands. Because type and typography has his major interest he wrote in 1994 with graphic designer and teacher Geert Setola the first version of Letterfontein (Letter Fountain) in dutch and french. In 1996 the german version was published. In 2002 Joep pohlen began to rewrite and enhance Letterfontein and published in 2009 the fourth dutch edition. Polka Design has received several design awards during its existence, including a red dot award and a TDC award for the new edition of Letterfontein (Letter Fountain). Taschen Publishers is publishing the first spanish, english, french and german version of the fourth edition of Letter Fountain.