Roy wrote the ad and the immortal Dave Nevland engineered the production of it,
but the zooby-zooby-zooby-zooby-zooby audio signature is the work
of the astoundingly talented Michael Torbay for just 6k.
Torbay/6k! – Indy Beagle

Dave Nevland has been producing the wizard’s radio ads along with the audio version of the Monday Morning Memo for the past 24 years. Did you hear me? I said 24 years! – Indy