Margery W. Mayer

Houghton Mifflin Harcourt Co. engages in the provision of pre-K-12 education solutions, delivering content, technology, services, and media. It operates through the following segments: Education and HMH Books & Media. The Education segment provides educational products, technology platforms and services. The HMH Books & Media segment primarily develops, markets and sells consumer books in print and digital formats and licenses book rights to other publishers and electronic businesses. The company was founded in 1832 and is headquartered in Boston, MA.

Public Prep Network, Inc. operates schools. The private company is based in New York, NY.

Teacher Synergy LLC provides educational services. It is the an open marketplace for educators to buy, sell, and share original resources. The company was founded by Paul Edelman in March 2006 and is headquartered in New York, NY.

MetaMetrics, Inc. engages in development of scientific measures of academic achievement and complementary technologies. It offers training, resource measurement, and customized consulting services. The company was founded by A. Jackson Stenner and Malbert Smith III in 1984 and is headquartered in Durham, NC.

Cambium Learning Group, Inc. engages in the provision of educational solutions and services. It operates through the following business segments: Learning A-Z, Voyager Sopris Learning, and ExploreLearning. The Learning A-Z segment offers technology-enabled learning resources for PreK-6 education. The Voyager Sopris Learning segment provides technology, materials, and professional development for educators. The ExploreLearning segment develops STEM-based curriculum tools in the field of math and science. The company was founded in 2009 and is headquartered in Dallas, TX.