Houghton Mifflin Harcourt Learning Technology originally started as Riverdeep Interactive Learning, 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.

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  • 1995-01-01 00:00:00 (xsd:date)
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  • Houghton Mifflin Harcourt Learning Technology originally started as Riverdeep Interactive Learning, 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.
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  • Houghton Mifflin Inc.
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  • USA, Ireland
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  • Houghton Mifflin Harcourt Learning Technology originally started as Riverdeep Interactive Learning, 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.
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  • Houghton Mifflin Harcourt Learning Technology
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  • Houghton Mifflin Inc.
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