David Nelson Farr (born 1955) is an American business executive. He is the Chairman and CEO of Emerson Electric Company, a Fortune 500 company. Mr. Farr has worked at the company since 1981. He is married with two children and is a resident of Ladue, Missouri.On 25 Oct 2011, IBM announced Mr. Farr is elected to its Board of Directors, and he joined the board on January 1, 2012.