The bibliometric data used for calculating the citation-based metrics were collected on January 12, 2026. A key metric that determines a scientist’s position in the ranking is the D-index (Discipline H-index). The D-index specifically measures citations and publications within an examined discipline, thereby focusing on the researcher’s impact within their field rather than across all fields.
Scope of Research and Qualification Criteria
This ranking evaluates the scholarly profiles of 279,971 scientists identified across a spectrum of bibliometric sources and disciplines. Within this comprehensive dataset, 229 scientists specializing in Engineering and Technology were specifically examined for inclusion in the ranking.
To qualify, a scientist's D-index had to meet a minimum threshold of 30, ensuring a level of sustained academic impact. Additionally, a majority of their tier publications had to be situated within the Engineering and Technology domain. Recognition of awards and achievements within this field further informed the qualification process.
The threshold for the D-index is dynamically set in increments of 10 according to the estimated size of the scholar population within each discipline, thus guaranteeing the incorporation of the top 1% of leading scholars. Furthermore, only those researchers whose general H-index aligns closely with their D-index — with a difference of 30% or less — were considered, reinforcing a strong disciplinary focus in the ranking.
Verification and Methodological Rigor
Understanding that raw bibliometric data cannot fully encapsulate scholarly output or impact, our team conducted meticulous manual verification of each scientist’s profile. This process involved cross-referencing against a broad array of trustworthy publication sources to validate the authenticity and relevance of the data.
While the number of publications in prestigious journals and leading conference proceedings does not directly influence the ranking position, we acknowledge it as an important secondary indicator of a researcher’s contributions to their field. The final ranking leverages the D-index, calculated from verified bibliometric data drawn primarily from OpenAlex and CrossRef — two of the most authoritative and widely used databases available to the research community.
For a detailed review of the criteria and processes involved, readers are encouraged to visit our methodology page.
Research.com’s Mission and Vision
At Research.com, our mission is to inspire and equip researchers, industry leaders, and policymakers worldwide by illuminating where top experts are focusing their efforts. We provide the scientific community with a transparent, credible, and comprehensive means of identifying leading specialists across diverse disciplines, countries, and institutions.
Through this ranking, we aim to facilitate informed decision-making, foster collaboration, and highlight excellence in Engineering and Technology research. The meticulous and thoughtful approach underpinning this initiative reflects our commitment to advancing the global scientific ecosystem.
