Pels - Leusden had been collecting the artist 's works since 1950 , and created his first Kollwitz exhibition in 1965 .
The museum opened in 1986 , and traces its origins to the art collector Hans Pels - Leusden ( d. 1993 ) .
Hans Pels - Leusden     had been collecting the artist 's works since 1950 , and created art collector 's first Kollwitz exhibition in 1965 .
The museum opened in 1986 , and traces its origins to the art collector Hans Pels - Leusden ( d. 1993 ) .