Please visit Dr. Heffernan's Google Scholar and DBLP pages. According to Google Scholar, Dr. Heffernan's 200+ papers have been cited 7,000+ times (as of June 2020).
Dr. Heffernan has published 20+ randomized controlled experiments. Over 18 external researchers have used ETRIALS to run their own studies.
Dr. Heffernan is proud of the fact that he practices open science and gives out data sets; he is aware of over 100 other papers that have used these data sets to publish their own discoveries.
Neil Heffernan's OSF is osf.io/uyxdc while his OIRCD id is https://orcid.org/0000-0002-3280-288X.
Cristina Heffernan's OSF account is osf.io/fgvpy and her ORCID is https://orcid.org/0009-0009-4114-9892.
Heffernan, N. T (2001). Intelligent tutoring systems have forgotten the tutor: Adding a cognitive model of human tutors Dissertation. Computer Science Department, School of Computer Science, Carnegie Mellon University. Technical Report CMU-CS-01-127. (Pieces published as CP1, CP8, CP5, CP4, and CP3)