All bibliometric data used to devise the ranking’s citation-based metrics were collected on January 12, 2026. A scientist’s position in the ranking hinges on their D-index (Discipline H-index), a refined metric that considers only publications and citations within the scientist’s specific discipline—in this case, Psychology. This ensures that the evaluation is tailored to the researcher’s scholarly contributions strictly related to the relevant field.
Scope of Research and Qualification Criteria
The ranking is based on the analysis of 279,971 scientist profiles identified from a diverse array of bibliometric data sources spanning all academic disciplines. Specifically, 1,000 scientists within the field of Psychology were examined in depth. To qualify for inclusion in this ranking, a scientist was required to have a D-index of at least 30, with a majority of their tier publications clearly focused on Psychology.
Additional consideration was given to a scientist’s awards and professional achievements within the field, supporting a well-rounded evaluation. The D-index threshold for considering top researchers is dynamically set in increments of 10, depending on the estimated population size of scholars within each discipline. This methodology ensures inclusion of the top 1% of leading scholars while maintaining rigor. Furthermore, there is a stipulated proximity limit of 30% or less between a scientist’s general H-index and their D-index, ensuring that their dominant contributions are aligned with the discipline under review.
Verification and Methodological Rigor
The Research.com team is keenly aware that raw bibliometric data should not be regarded as an absolute measure of a scholar’s output and impact. Consequently, all scientist profiles included in the ranking underwent manual verification. This process involved cross-referencing publications against a wide range of trustworthy and authoritative sources to validate authorship and disciplinary relevance.
While the number of papers published in prominent journals and conference proceedings does not directly influence the ranking position, it serves as a valuable secondary indicator of a scientist’s influence and contribution within their specialty.
Positions in the ranking are established solely based on the D-index, leveraging aggregated data from OpenAlex and CrossRef, which are the most prominent and trusted bibliometric databases currently accessible to the research community. To explore the comprehensive details and nuances of the methodology used, please visit our methodology page.
Research.com’s Mission and Vision
At Research.com, our mission in creating this ranking is to inspire researchers, policymakers, academic institutions, and industry leaders worldwide to observe and understand where leading experts in Psychology—and other fields—are focusing their efforts. We strive to provide the scientific community with transparent and credible insights into who the foremost experts are in specific areas of study, across countries, and within research institutions.
By delivering meticulous and carefully curated rankings, we aim to facilitate collaboration, innovation, and informed decision-making that advances science globally.
