He’s the former founder of the New Age, spiritual movement. Not sure if he’s mentioned because there are spiritual things in Zak McKracken, or because he’s also a programmer 
He is not. He´s there because he was basically a plot consultant. That´s about it. David Fox met with him for a brainstorming session during very early development for about a day or so. That is why he got a credit I presume.
Thank you, I had read your clear explanation after writing my answer.
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Zak came at a funny point in time for me.
When I first played the game my family subcribed to the Time Life series of books called “Mysteries of the Unknown”.
So I would play the game and look at the books and go:“Oh wow everything in the game is based on things and ideas from the real world!”
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Hilarious… 
I haven’t thought about those books in so long. The commercials were on TV constantly back then. The correlation with Zak makes total sense now that I think about it.
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Oh I used to find them so creepy! A few of those are on youtube and they´re hilarious in hindsight, but well times were simpler then.
Stonehenge
The big pyramid and the sphinx
The Bermuda Traingle and Atlantis
The Face on Mars
It´s all in there! Fun times.
Those books and Zak totally go together in my mind.