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.