I always wondered what the guy looked like that did Popeye's voice. BTW, I think Robin Williams did a great job of portraying Popeye in the movie. Shelly Duvall was also quite good as Olive Oil.
Despite voicing Popeye for 50 years hardly anyone would be able to pick Jack out..He rarely appeared on camera, did not do any autograph signings and made few personal appearances..nice post.
At least the late Michael Sporn got him to talk for a recorded interview (where he brings up his appearance on this show)... cartoonresearch.com/index.php/michael-sporn-remembered-his-interview-with-jack-mercer/