by Lassen owns the rights to the designs of two of Denmark's greatest architects- Mogens Lassen (1901-1987) and Flemming Lassen (1902-1984). The Lassen brothers were extremely talented and were honoured with many awards and grants for their unique designs and iconic architecture. by Lassen is a family business whose simple mission is to carry the Lassen legacy forward- because good design lives on through new generations.