Paola Sztajn is a Professor of Mathematics Education at North Carolina State University and is a Principal Investigator in Project AIM (All Included in Mathematics). 

Daniel Heck is Vice President of Horizon Research, Inc. in Chapel Hill, North Carolina and is a Principal Investigator in Project AIM. 

Kristen Malzahn is a Senior Researcher at Horizon Research, Inc. in Chapel Hill, North Carolina and a co-Principal Investigator in Project AIM. 

You can read more about the Math Discourse Matrix in the writing team’s new book, Activating Math Talk: 11 Purposeful Techniques for Your Elementary Students.