Houghton Mifflin Harcourt Learning Technology

==Riverdeep==
===1995-present===
rd01_top_rdlogo.gif|Stacked version.
==Houghton Mifflin Harcourt Learning Technology==
===2010-2011===
===2011-2012===
===2012-present===
====2012-2013====
====2013-present====
Category:Video game publishers
Category:Ireland
Category:United States
Category:1995
Category:Publishing
Category:Boston
Category:Massachusetts
Category:Mergers