"Herst," in case someone's Googling. I corresponded with Herman Herst for a year or two, and have various memorabilia I'll put on
ebay someday.
I was trying to sell him my collection of 19th Century U.S. stamp magazines, but since he and his wife had moved to a Florida apartment by that point of time, she had laid down the law -- stamps only, no more books, magazines, scrapbooks, memorabilia, etc.
It is said that he answered every piece of mail the day it arrived, and didn't go to bed until he was caught up (again).