He is the designer of the Adventure which is a 35m trimaran motor yacht which completed a circumnavigation in 1998.
He also designed the B&Q/Castorama [fr] which is a 23 m sailing trimaran used by Ellen MacArthur to break the world record for solo circumnavigation in 2005.
Irens' designs are recognized for their simplicity, efficiency, and, essential elegance.
[4] They synthesise traditional forms with modern materials and methods of construction, with Carbon fibre masts,[2] laminated frames,[3] and epoxied strip wood[5] strongly in evidence.
The late Ed Burnett worked for Irens at the start of his career as a yacht designer.