Ranking positions are determined by the cumulative D-index (Discipline H-index) of all affiliated scholars at a given institution whose principal research focus is within Engineering and Technology. The D-index metric includes exclusively those publications and citations directly tied to the reviewed discipline, thereby guaranteeing robust relevance and field specificity.
Scope of Research Analyzed
An extensive evaluation was performed, reviewing 279,971 scientist profiles identified from diverse bibliometric data sources. From this pool, 50,429 scientists specifically within Engineering and Technology were analyzed in depth. To foster a high standard of research excellence, only scientists with a qualifying D-index of at least 30 were included, and the majority of their major publications needed to be in the Engineering and Technology field.
Additionally, notable awards and achievements of scientists in this area were considered. The D-index threshold for recognizing top researchers is incremented by 10, adapted to the total number of scholars estimated in each sub-discipline, with a guarantee to include the top 1% of leading experts. An inclusion criterion was also set, requiring a proximity of 30% or less between a scientist’s general H-index and their D-index. Both these metrics, along with professional accolades, ensure only the most impactful contributors are incorporated.
Verification Practices and Additional Quality Measures
The integrity of this ranking is further enhanced by meticulous verification practices. Recognizing that raw data alone cannot fully capture scholarly excellence, every scientist profile underwent manual verification and was cross-referenced with publications from a wide array of authoritative sources.
Even though the number of publications in leading journals and conference proceedings is not a direct ranking criterion, this information provides a meaningful secondary indication of a scientist’s impact in their area. Rankings are established according to the scientists’ H-index metrics drawn from OpenAlex and CrossRef—world-renowned bibliometric databases recognized by the academic community.
To learn more about the rigorous methodologies guiding our assessments, please refer to our methodology page.
Research.com’s Mission
At Research.com, our mission is to motivate scientists, industry leaders, and policymakers globally to uncover trends among top experts, and to equip the academic community with reliable insights into who the leading specialists are within specific disciplines, in different countries, and even at the institutional level.
Key Results of the 4th Edition Ranking
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Top 3 Spanish institutions with the highest number of leading scientists:
- Universitat Politècnica de Catalunya – 21 scientists
- University of Seville – 15 scientists
- University of Zaragoza – 13 scientists
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The most prominent global institutions represented:
- Rice University
- Pennsylvania State University
- University College Dublin
- HEC Montréal
- Quaid-i-Azam University
- Northwestern University
- Stanford University
- Carnegie Mellon University
- Penn State Harrisburg
- The University of Texas at Arlington
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Top 3 scientists worldwide in Engineering and Technology:
- Professor Frederick E. Shelton (Johnson & Johnson, United States) – D-index: 257
- Menachem Elimelech (Rice University) – D-index: 200
- Bruce E. Logan (Pennsylvania State University) – D-index: 163
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Key bibliometric benchmarks:
- The average total D-index for the top 5% of universities is 2,073, compared to an average of 305 across all 1,290 ranked institutions.
- The average number of published articles in Engineering and Technology by scientists from the top 5% of institutions is 10,087, against 1,480 for all 1,290 universities.
- The average number of citations for researchers in the top 1% universities stands at 1,279,971, far exceeding the 71,259 average for all universities included in the ranking.
This ranking is the result of careful, methodical, and transparent research, establishing a robust and credible benchmark for scientific excellence in Engineering and Technology in Spain and beyond.
