He died in 1955 in New Jersey.
He was 76.
He died of an aneurysm in his abdomen.
According to his wishes, he was cremated the same day he died ( but not his brain) and his ashes were scattered somewhere.
There is no grave.
A pathologist removed his brain, without permission at first... and kept the brain in 2 mason jars.
There was pieces tested over the years, and it was returned to a pathologist at Princeton Hospital in 1998 !!