Gilbert, the author of 80 books, wrote on the subjects of the Holocaust, World War I and World War II, and Jewish history, as well as Winston Churchill.
The self-proclaimed “Facebuker Rebbe” for his efforts over Facebook was a passenger in a vehicle that lost control on an icy road in Maryland and struck another car.
The Amsterdam native and later New Yorker released a book based on his correspondence in concentration camps with the woman who would become his second wife.