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Joseph Louis Rosefield (18 Dec 1882 - 8 Nov 1958) was a California food businessman who invented modern, nonseparating peanut butter in 1922 – 1923. His family business, the Rosefield Packing Company, was based in Alameda. His new production process was licensed to another company to make Peter Pan peanut butter in 1923. Rosefield Packing later marketed Skippy peanut butter in 1932; both brands are still sold today. It also introduced cylindrical "wide-mouth" jars for peanut butter in 1935. Peanut butter then became a vast food industry. Among other roles, Rosefield Packing provided emergency supplies of peanut butter to Hawaii during World War II. Rosefield's family sold Rosefield Packing and the Skippy brand to Best Foods in 1955.