He developed an interest in modern and contemporary art at a young age, frequently visiting the State Gallery in Stuttgart.
[3] In early 2001, Lange was appointed assistant curator at the Gemäldegalerie Alte Meister in Kassel.
[citation needed] In 2004, Lange became the curator of paintings, graphic art, and sculpture at the Municipal Museum of Braunschweig.
[3] In December 2009, Lange returned to Kassel as Head of the Old Masters at the Gemäldegalerie Alte Meister).
His exhibitions and catalogues have significantly contributed to the understanding and appreciation of important artworks by artists from Northern Europe.