Houghton Mifflin Harcourt Company, a learning technology company, provides curriculum, supplemental, intervention solutions, and professional learning services worldwide. It offers education programs in disciplines including reading, literature, math, science, and social studies; and extensions, such as supplemental and intervention solutions, professional services, professional resources, and educational services for teachers under the Heinemann brand. The company was formerly known as HMH Holdings (Delaware), Inc. and changed its name to Houghton Mifflin Harcourt Company in October 2013. Houghton Mifflin Harcourt Company was founded in 1832 and is headquartered in Boston, Massachusetts. As of April 6, 2022, Houghton Mifflin Harcourt Company was taken private.