 BOSTON, March 26, 2021 PRNewswire -- Learning technology company Houghton Mifflin Harcourt HMH today announced new senior leadership appointments in support of its digital first, connected strategy, which focuses on building and delivering purposeful technology that increases teacher capacity and enables personalized instruction for all learners across the achievement spectrum. Greg Collins has joined HMH as Senior Vice President, Platform, and will lead product management and strategy for HMHs platform, Ed, which saw user growth of 306 in 2020. 