sentences:  In 1941, he paired with furniture designer Jens Risom to launch the Hans Knoll Furniture Company.Risom designed 15 of the 20 pieces of furniture in the Hans Knoll Furniture Company's "600" line, which began production in 1941.In 1943, Knoll was approached by Florence Schust, an architect who had studied under Ludwig Mies van der Rohe and Eliel Saarinen.