John Richard ("Jack" or "J.R.") Simplot (January 4, 1909 " May 25, 2008) was the founder of the J. R. Simplot Company, a Boise, Idaho based agricultural supplier specializing in potato products. In 2007 he was estimated to be the 89th-richest person in America, at $3.6 billion. At the time of his death at age 99 in May 2008, he was the oldest billionaire on the Forbes 400.