Melvil Dewey
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Melvil Dewy
It was developed in 1876. SO WAS UR NAN
Melvil Dewey created the Dewey Decimal system. It is a classification system used by libraries, and not what is meant in the question. The decimal number system is the number system that we all use on a daily basis; it was invented by a succession of Arab and Hindu mathematicians beginning about 1400 years ago.
If you mean the Dewey Decimal Classification, a system of organizing library books by subject: that was invented by Melvil Dewey in 1876.If instead you mean the decimal-based metric system: the impetus for the invention came from King Louis XVI of France in the 1790s, but the idea itself is at least a century older than that.
Dewey decimal system