The name "Gerald Gardner" is most commonly associated with Gerald Brosseau Gardner, a British civil servant, author, and occultist, who is considered the founder of modern Wicca. He died on February 12, 1964.
There might be a different Gerald Gardner you're thinking of, or perhaps there's been a mistake in the name. If you can provide more information, I might be able to help you find the person you are looking for.