Sylvan J Zaft (1935 – 2015) was a very active Esperantist who lived and taught in Detroit. After his death Dr. Zaft’s Esperanto publications were assembled on the celebratory website, sylvanzaft.org.
Many years earlier Dr. Zaft had generously given permission for the publication of his very readable discussion of Esperanto’s qualities and difficulties for English speakers – Esperanto – A Language for the Global Village. Later he made this book and some other items available on Amazon’s Kindle, where they still can be very easily and cheaply consulted.