In 1665 he was appointed by the city of Amsterdam as the official historian.
But official historians have shied away from putting a number to it all.
For 10 years, he has been its official historian.
He also served as the official historian of the Manhattan Project.
Rosen writes at times like an official historian, dedicated to leaving nothing, and no one, out.
He was 89 and had been the borough's official historian from 1980 until last year.
Peter Edwards was appointed the official historian for the series in 1982.
Long believed that this motivation was shared by the official historians in the other Dominion countries.
They have been aggressively debunked by journalists and official historians ever since.
The Menzel of the big painting is the official historian, and he does a fine job.