Houghton Mifflin Harcourt Company (NasdaqGS:HMHC) acquired Waggle for $5.4 million on January 14, 2019. Waggle’s employees, including Chief Executive Officer Aoife Dempsey, will join the Houghton Mifflin Harcourt’s team effective immediately. Houghton Mifflin Harcourt Company (NasdaqGS:HMHC) completed the acquisition of Waggle on January 14, 2019.