Bob Daisley is an Australian musician, best known for his work as the bassist and backing vocalist for the hard rock band Ozzy Osbourne, as well as his involvement in the creation of some of Ozzy's most iconic songs.
If you're looking for a more in-depth article about Bob Daisley and his book, here's a brief summary:
Daisley is famous for being a "meticulous diarist," meaning the book is backed by sharp, dated recollections rather than hazy rock-star memories. Record Collector Magazine For Facts Sake: Bob Daisley: 9780992276003 - Amazon.com