Yeah I read the book. I have all his books. 30 YEARS was by far his best. It's still being published but in a edited version. So make sure you read the first edition, it has several hundred pages as oppose to the edited booklet version. Schnell had been a Bible Student during WWI. he implanted all the dictatorial rules of the Society in Germany, as Germany was the playing ground zero for Rutherford's takeover as Pope of the Watchtower. It's a good book as Schnell describes how the Society went from a Russell's Bible Students to what is now the Jehovah's Witnesses. I highly recommend it.
RR