Seiyuu
Jin has 2 known voice actors: one is for the original Japanese version of the show while the other is for the American FUNimation dub.
Japanese Seiyuu
Mitsuo Yamaguchi goes by the name, Kappei Yamaguchi. Born in 1965, his more notable roles include Ranma (Ranma 1/2), InuYasha, L (Deathnote), and Jimmy Cudo (Case Closed).
He voiced Jin in 1992.
You can read more about him at Wikipedia or his fansite, the Kappei index.
American Seiyuu
Jerry Jewel, ironically, also voices Jimmy Cudo in Case Closed. He started voice acting in 2001 and provided the voice for Kyo from Fruits Basket.
Jerry did the Irish voice for Jin in 2002 as well as voicing Suzaku.
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