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 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.
In October 2002, Riverdeep became a private entity when their stock price plummeted below $2 in NASDAQ.
On September 20, 2004, Riverdeep moved its Novato office to 100 Pine Street in San Francisco.
Read more about Houghton Mifflin Harcourt Learning Technology: Hamtaro PC Game, Houghton Mifflin, Reed Elsevier
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