Media Source Inc.
Country of originUnited States
Headquarters locationPlain City, Ohio
Publication typesMagazines
Owner(s)The Vistria Group

Media Source Inc. (MSI) is an American company based in Plain City, Ohio. It began in 1980 as Pages and changed its name in March 1999.[1] It owns Horn Book, including The Horn Book Magazine, Junior Library Guild, Library Hotline, Library Journal (acquired in 2010),[2] and School Library Journal (acquired in 2010),[2] and Digital Shift.[3] All of these holdings are under its subsidiary MSI Information Services, the primary trade name under which the company does business. MSI was purchased by the private equity firm RLJ Equity Partners in 2011.[4]


  1. ^ "Company Overview of Media Source Inc". Businessweek. Bloomberg. Archived from the original on July 9, 2012. Retrieved April 10, 2012.
  2. ^ a b "Library Journal Bought by Ohio-based Media Source Inc". LIS News. March 1, 2010.
  3. ^ "About", Digital Shift, Media Source Inc., retrieved May 30, 2014
  4. ^ RLJ Equity Partners, LLC Announces the Acquisition of Media Source, Inc.