Bibliometric data essential for constructing citation-based indicators were collected on January 12, 2026. The positioning of each scientist in the ranking is adjudicated through their D-index (Discipline H-index), a refined metric that selectively includes only those papers and citations directly pertinent to the specified discipline under examination. This approach ensures that the ranking reflects discipline-specific scholarly influence rather than general citation volume.
Scope of Research and Ranking Criteria
The ranking evaluated 279,971 scientist profiles identified across multiple bibliometric sources representing all scientific disciplines. Within this extensive cohort, 38 scientists specializing in Engineering and Technology were analyzed in detail.
To qualify for inclusion in the Engineering and Technology segment of the ranking, candidates were required to meet rigorous thresholds. Firstly, a scientist’s D-index had to be at least 30 to ensure a demonstrable impact within the field. Secondly, a majority of a qualifying scientist’s tiered publications needed to be explicitly within the Engineering and Technology domain. Additionally, scientists' awards and notable achievements specifically within Engineering and Technology were factored into the consideration process, providing qualitative context alongside bibliometric measures.
The threshold for the D-index is calibrated as increments of 10 relative to the estimated total number of scholars in each discipline. This stratification ensures that the top 1% of leading scholars are systematically incorporated into the ranking. Furthermore, to maintain relevance to the focal discipline, scientists included exhibit a proximity of no more than 30% between their overall general H-index and their discipline-specific D-index.
Verification and Validation Procedures
Recognizing that raw bibliometric data alone cannot conclusively evaluate scholarly output, the Research.com team employed stringent manual verification practices. Each scientist’s profile was carefully reviewed and cross-correlated against publications indexed in a wide variety of credible scientific sources. This labor-intensive step helps to confirm the accuracy and authenticity of the data underlying each profile.
Although not a direct factor influencing the ranking position, the volume of published papers in prestigious journals and internationally recognized conference proceedings is considered a valuable secondary indicator of a researcher's impact within their specific scientific area.
The final ranking positions are determined using the D-index derived from the most authoritative bibliometric information available via OpenAlex and CrossRef, underpinning the ranking’s credibility. Additional methodological details can be found on our methodology page.
Research.com’s Mission Behind the Ranking
At Research.com, our mission is to inspire researchers, academic institutions, industry leaders, and policymakers worldwide to identify and understand where leading scientific expertise is concentrated and evolving. This ranking serves as an essential resource for the scientific community to recognize who the foremost experts are in specific disciplines, across countries, and within research institutions.
We are committed to providing a transparent, accurate, and methodologically sound platform that highlights excellence in scientific research, fostering connectivity and collaboration across the global research ecosystem.
