houghton mifflin inc. the former riverdeep logo . type private industry cd rom software founded 1995 headquarters boston and dublin parent houghton mifflin harcourt website 1 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 . 1 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 . 2 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 . 3 contents 1 hamtaro pc game 2 houghton mifflin 3 reed elsevier 4 references 5 external links hamtaro pc game edit riverdeep also helped on a game called hamtaro wake up snoozer houghton mifflin edit on december 22 2006 it was announced that riverdeep plc had completed its acquisition of houghton mifflin . the new joint enterprise would be called the houghton mifflin riverdeep group . riverdeep paid 1.75 billion in cash and assumed 1.61 billion in debt from the private investment firms thomas h. lee partners bain capital partners and the blackstone group . 4 tony lucki a former non executive director of riverdeep would remain in his position as houghton mifflin s chief executive officer . hm rivergroup indicated it wanted to capitalize on the convergence of print and digital education platforms . reed elsevier edit in july 2007 reed elsevier an information and publishing group offloaded harcourt us schools education business to houghton mifflin inc. for 4.0 billion with 3.7 billion payable in cash and 0.3 billion payable in common stock of houghton mifflin inc. 5 houghton mifflin was privately held . existing investors put up 23 million of equity financing to help to meet the 3.7 billion cash requirement for the purchase . reed took a 300 million stake in houghton mifflin inc. which left it with 11.8 per cent of the common stock in the enlarged company . 6 the combined business became known as houghton mifflin harcourt hmh and a new holding company empg was created . the riverdeep name is no longer used by hmh . references edit master of the textbook takeover rt business riverdeep to de list from nasdaq textbook publisher houghton mifflin harcourt prices ipo at 12 a share irish company completes houghton mifflin acquisition boston.com reed elsevier reed elsevier announces sale of harcourt us schools education business to houghton mifflin riverdeep group for 4.0 billion houghton mifflin to buy harcourt boston.com dead link dead link external links edit corporate website v t e houghton mifflin harcourt cliffsnotes great source harcourt school supply heinemann us holt mcdougal rigby us riverside saxon steck vaughn houghton mifflin harcourt learning technology the learning company broderbund edmark retrieved from https en.wikipedia.org w index.php title houghton mifflin harcourt learning technology & oldid 628921951 categories cd rom publishing companiesonline publishing companiespublishing companies of irelandpublishing companies of the united statespublishing companies established in 1995companies based in massachusettshidden categories all articles with dead external linksarticles with dead external links from august 2011 navigation menu personal tools not logged intalkcontributionscreate accountlog in namespaces article talk variants views read edit view history more search navigation main pagecontentsfeatured contentcurrent eventsrandom articledonate to wikipediawikipedia store interaction helpabout wikipediacommunity portalrecent changescontact page tools what links hererelated changesupload filespecial pagespermanent linkpage informationwikidata itemcite this page print export create a bookdownload as pdfprintable version languages add links this page was last modified on 9 october 2014 at 13 15 . text is available under the creative commons attribution sharealike license ; additional terms may apply . by using this site you agree to the terms of use and privacy policy . wikipedia is a registered trademark of the wikimedia foundation inc. a non profit organization . privacy policy about wikipedia disclaimers contact wikipedia developers cookie statement mobile view