There was no romantic connection between Giselle MacKenzie and Jack Benny. Their relationship was strictly professional.
Jack Benny was never known to be involved in any scandals, nor were implications ever made to that effect by anybody who would have known of such things.
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That's not entirely true.
In a filmed interview, MacKenzie stated that Jack had asked her never to confirm or deny the rumor, and she never did.
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Read George Burns book. They both cheated on their wives. Yes, he did have a relationship with Gisele.
On a TV special about Benny, Mackenzie said, "Jack told me, "If anyone asks you if we ever had an affair, never say that we did and never say that we didn't', and I always keep my secrets!"
The Jack Benny Program - 1950 New Year's Eve - 12.11 was released on: USA: 31 December 1961
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Jack Griffo :)
Sheldon Leonard