Key in defining the global scale of the world's largest facilities management company ISS A/S.

[1] This stable financial background enabled David and his sisters to survive the early deaths of their parents.

At the early age of 33, he was granted the right to plead cases before the Danish Supreme Court.

[1] David made a name for himself with his defense of Emil Glückstadt (1875–1923), director of Landmandsbanken, which went bankrupt in 1922, causing Denmark's then biggest financial scandal.

This allowed him to either invest knowledgeably or negotiate a remuneration package that was in part paid in shares.

David was allowed to continue his daily life as lawyer and businessman, although because of his partly Jewish heritage, he came under attack from Danish Nazis.

In 1943, following a series of strikes and sabotage of various strategic assets and military production facilities, the occupation authorities dissolved the Danish government.

David fled to neutral Sweden, from where he continued to manage ISS on an operational and strategic level.

It now consists of 4,000 Islamic works of art, including c. 350 coins, presented in 20 sections divided chronologically.