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Houghton Mifflin Harcourt Learning Technology, originally started as Riverdeep Interactive Learning, is a publishing house for educational online and CD-ROM products based in San Francisco, United States and Dublin, Ireland. Founded in 1995, Riverdeep was principally the creation of the Irish ex-investment banker Barry O'Callaghan. O'Callaghan was Riverdeep's CEO and controlling shareholder.〔(Master of the textbook takeover )〕 Riverdeep also acquired the companies Broderbund, The Learning Company and Edmark, and became a distributor for said companies. In October 2002, Riverdeep became a private entity when their stock price plummeted below $2 in NASDAQ.〔(RTÉ Business: Riverdeep to de-list from Nasdaq )〕 On September 20, 2004, Riverdeep moved its Novato office to 100 Pine Street in San Francisco. Houghton Mifflin Harcourt officially became a publicly traded company on November 14, 2013, with common shares of stock listed on the NASDAQ exchange.〔(Textbook publisher Houghton Mifflin Harcourt prices IPO at $12 a share )〕 == Hamtaro PC Game == Riverdeep also helped on a game called ''Hamtaro: Wake Up Snoozer!'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Houghton Mifflin Harcourt Learning Technology」の詳細全文を読む スポンサード リンク
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