Leon Klaassen Bos was born in Volendam, The Netherlands and started his career early. At eleven, he created a cotton khaki shirt-dress with bat-sleeves for his first client. At the age of sixteen, he won third prize for daywear in a national design contest, which he won in the knitwear category the following year. This led to contracts with several knitwear companies which allowed him to finance his first collection, which he presented in 1988 at the age of nineteen. Due to the success of the show, he enrolled at the Couture Akademie Bijenveld where he studied, graduating in 1992. While he was studying fashion design at the university he took an apprenticeship with couturier Frank Govers – where he realized his passion for couture and craftmanship. For the next three years, he created glamourous costumes and outfits for nightlife personalities in Amsterdam, New York and Paris.

In 1996 Leon Klaassen Bos was hired as head designer by former topmodel Katoucha Niane, who had started her own fashion house. He designed three collections which were presented in shows at the Carroussel du Louvre, and other venues in France and Africa by the supermodels of the time including Carla Bruni. Katoucha also introduced Leon to Yves Saint Laurent in 1997, who invited him to gain added experience in the techniques involved in the creation of haute couture designs. In 1999, one of his collections for Katoucha was shown in the Royal Palace in Amsterdam for Dutch Queen Beatrix and Prince Claus; after the show the pieces went on exhibition in the Stedelijk Museum. This led to commissions from private clients in Holland. In 2002 and 2003 he was invited to be a fashion stylist and TV host in an acclaimed television make-over show.

Since 2004 Leon has focused on couture design. By blending his knowledge of history, architecture and modern technology, with his experience in the Paris ateliers, Leon creates innovative and sculptural designs moulded to compliment the curves of a woman.

His latest creation has been exhibited at the ‘Smart Technology’ exhibition for the NEMO Science Centre in Amsterdam: a magical mix of seduction and hi-tech, history and futurism in an innovative and stylish LED light dress.