Citation Rankings
Highly Cited Researchers

Technische Universität Clausthal Highly Cited Researchers CitationEngineering & Technology / Petroleum Engineering Rankings 2025

Citation Rankings (Highly Cited Researchers) and the list of the most cited and influential researchers cover a wide range of scientific fields, spanning 197 main and sub-disciplines, as well as the Art and Humanities Citation Rankings and Social Sciences and Humanities Citation Rankings, offering a unique service. Additionally, the list without CERN, Statistical Data, etc., provided exclusively by “AD Scientific Index”, is part of our effort to balance the situation created by CERN and researchers with statistical data, who have an advantage over others, especially those in the social and humanities fields. There should be new regulations for multi-author and CERN papers. Citation lists also reveal many rule violations and unethical practices. See also for more specific citation analyses: Scientists Last 6 years Citation IndexUniversities Total Citations Rankings 2025 and Universities Last 6 Years Citations Rankings 2025

* Total Citation Counts Rankings
Ranking Based On Selection :1
Germany
Weller A
Geophysik
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,422
1,492
0.436
* Total Citation Counts Rankings
Ranking Based On Selection :2
Germany
Leonhard Ganzer
Petroleum Engineering
Underground Gas storage
CCS/CCUS
Geothermal Engineering
Hydrogen storage
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,366
1,876
0.793
* Total Citation Counts Rankings
Ranking Based On Selection :3
Germany
Birger Hagemann
Petroleum Engineering
Underground Hydrogen Storage
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,001
918
0.917
* Total Citation Counts Rankings
Ranking Based On Selection :4
Germany
Calvin Lumban Gaol
Petroleum Engineering
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
159
152
0.956
* Total Citation Counts Rankings
Ranking Based On Selection :5
Germany
Ramez Maher Abdalla
Petroleum Engineering
Software Development
Data Science
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
107
107
1.000
* Total Citation Counts Rankings
Rankings
281,810
Germany
11,038
19
Ranking Based On Selection: 1
Weller A
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
3,422
1,492
0.436
* Total Citation Counts Rankings
Rankings
380,211
Germany
14,254
32
Ranking Based On Selection: 2
Leonhard Ganzer
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
2,366
1,876
0.793
Petroleum Engineering
Underground Gas storage
CCS/CCUS
Geothermal Engineering
Hydrogen storage
* Total Citation Counts Rankings
Rankings
665,756
Germany
22,934
57
Ranking Based On Selection: 3
Birger Hagemann
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
1,001
918
0.917
* Total Citation Counts Rankings
Rankings
1,368,009
Germany
46,551
127
Ranking Based On Selection: 4
Calvin Lumban Gaol
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
159
152
0.956
* Total Citation Counts Rankings
Rankings
1,531,556
Germany
51,233
140
Ranking Based On Selection: 5
Ramez Maher Abdalla
Citation Metrics
Total
Last 6 Years
Last 6 Years / Total
107
107
1.000
Petroleum Engineering
Software Development
Data Science