John Blackman was an Australian radio and television presenter, voice-artist and comedy writer and author.
He was most widely known for his voice-over work for the long-running Nine Network comedy variety show Hey Hey It's Saturday from 1971 until 1999 and then returning for the reunion specials in 2009 and in 2021, with a brief relaunch in 2010.
Quite a funny little book! I think my favorite expression is "I hope your chooks turn into emus and kick your dunny down!" (see page 41 of the book for details), or maybe "Fuller than a seaside dunny on Boxing day" (page 80), it's hard to say;)