Short answers, pulled from the story.
The Hebrew University of Jerusalem received all literary rights and assets from Albert Einstein following his death in 1955. This transfer was mandated by a will signed by Albert Einstein in 1950.
The rise of Nazism in 1933 triggered efforts to save Albert Einstein's written material from seizure. Documents stored in Berlin were rescued while some items at the summer house in Caputh, Brandenburg were destroyed to avoid capture.
Manfred Waserman became the first curator of the Albert Einstein Archives with a term extending from 1988 to 1989. Ze'ev Rosenkranz succeeded him and served in that role from 1989 to 2003.
Current records indicate the collection now holds some 55,000 items. The archive initially contained around 14,000 documents at the time of Albert Einstein's death in 1955.
The original 46-page manuscript explaining the theory of general relativity ended up at the Hebrew University of Jerusalem in 1925. This document remains part of the Albert Einstein Archives.