New YorkNew York City Teacher Portal New York City Teacher Portal Welcome New York City Department of Education Teachers! This is your exclusive Houghton Mifflin Harcourt Teacher Portal for anytime, anywhere access to all things GO Math!®;Whether you are looking to register for professional development sessions, access webinars and elearning courses, collaborate with your colleagues, or simply access a GO Math! resource, it can all be done here. GO Math! Resources GO Math! is a comprehensive K–8 mathematics program developed to support the Common Core State Standards for Mathematics. The program emphasizes critical areas and depth of understanding through interactive lessons, research-based instructional approaches, best practices from around the world, and differentiated instructional resources to ensure success for all students. View Now Professional Development Resources Houghton Mifflin Harcourt Professional Development and Education will help you create positive change in your school. Together we can lay the foundation for sustainable student achievement. Contact Account Executive GO Math!® is a registered trademark of Houghton Mifflin Harcourt.