Starting Sept. 5, 2014, Genealogy.com will be making a big change. GenForum
message boards, Family Tree Maker homepages, and the most popular articles
will be preserved in a read-only format, while several other features will
no longer be available, including member subscriptions and the Shop.
Don't know if this will help, but I had previously posted a biography of Johannes to the SnedekerCousins (YahooGroups) files. There was a fair amount of information concerning his family, etc. This was secured from a book that was prepared under the auspices of the Holland Society. At the very least, the information could possibly be used as a springboard for further inquiry, particularly as to the sources.
It does make mention of Johannes being imprisoned (along with his son Garrett!) at Sugar House while he was a patriot during the Revolution. It also states that "Johannes caught the smallpox and died September 28, 1779 (sic) in prison."