The Koetser Family, Old Master Paintings Specialists, started their first gallery in the Spiegelgracht, Amsterdam, before the first World War and remained there until Henri Koetser moved the family to London in 1923 where his three sons entered into partnership. The firm expanded when offices were opened in New York, leading to the establishment of worldwide contacts among private collectors and museums throughout the USA. In 1967 the gallery opened at its present location in Zurich, where the resources of the firm, now the third generation, remains under David H. Koetser's leadership.