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In observance of the 2024 holiday season, Sage offices will be closed Monday December 23rd through Wednesday January 1st. Normal operations, including shipping for orders placed during the closure, will resume on Thursday January 2nd. For technical support during this time, please visit our technical support page for assistance options. 

We wish you a wonderful holiday season. Thank you. 

Heck, Daniel

Daniel Heck Horizon Research

Daniel Heck is Vice President of Horizon Research, Inc. in Chapel Hill, North Carolina and is a Principal Investigator in Project AIM. His research and development work spans many areas of mathematics education: classroom learning environments and discourse; teacher professional development design, enactment, and impacts; curriculum design and enactment; and student problem solving. Tying all of this work together is a central interest in how teaching and learning in school can tap into students’ intuitions, informal ideas, and insights to develop powerful, formal understandings of mathematics. He has enjoyed and benefitted from collaboration with colleagues in practice and research locally, across the country, and around the world who share this interest.