William Thompson (viticulturist)
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For other people named William Thompson, see William Thompson (disambiguation).
William Thompson (26 November 1816 - 19 October 1897) was an English born viticulturist, credited with the introduction and popularization of the Sultana grape in the Central Valley of California. Known widely as the Thompson Seedless variety in the United States, the high yielding pale green grape accounts for approximately 95% of raisins produced in California.