
	Dex One Corporation&nbsp;is an American marketing company providing online, mobile and print search marketing via their DexKnows.com website, print yellow pages&nbsp;directories&nbsp;and pay-per-click ad networks in the U.S.

	Dex One Corporation was formed in February 2010. It was previously the R. H. Donnelley Company, which was founded in 1886 by Reuben H. Donnelley, son of&nbsp;RR Donnelley&nbsp;founder Richard R. Donnelley, as The Chicago Directory Company.
