| S. Joseph | Antony | University of Leeds | United Kingdom | Chemical Engineering | Granular Mechanics | worldtopscientists.com |
| Innocent | Appiah | Hubei University of Automotive Technology | China | Engineering | Computer Science | worldtopscientists.com |
| Diamanto | Aretha | University of Patras | Greece | Health Professions | Anesthesiology and Intensive Care | worldtopscientists.com |
| Joseph | Arhavbarien | Rockedge Ventures (UK) Ltd | United Kingdom | Environmental Science | Environmental Sustainablity & Green Operations | worldtopscientists.com |
| Richard | Arias-Hernandez | The University of British Columbia | Canada | Social Sciences | Archival Science | worldtopscientists.com |
| Neha | Arolkar | Vasantrao Naik Marathwada Krishi Vidyapeeth, Perbhani state- Maharashtra | India | Agricultural and Biological Sciences | Horticulture | worldtopscientists.com |
| Muhammad | Arshad | Nanosciences and Technology Department, National Centre for Physics, Quaid-i-Azam University Islamabad | Pakistan | Physics and Astronomy | Material Sciences, condense matter Physics, Surface Science | worldtopscientists.com |
| Mahendra | Aryal | Trichandra Multiple campus, Tribhuvan University, Nepal | Nepal | Environmental Science | Bioremediation | worldtopscientists.com |
| Yashar | Aryanfar | Universidad Autónoma de Ciudad Juárez | Mexico | Energy | Renewable Energies | worldtopscientists.com |
| Makoto | Asashima | Teikyo University 、Advanved Comprehensive Research Organization | Japan | Biochemistry, Genetics and Molecular Biology | Developmental Biology, animal embryonic development | worldtopscientists.com |
| Evans | Asenso | University of Ghana, Department of Agricultural En | Ghana | Agricultural and Biological Sciences | Environmental Science | worldtopscientists.com |
| Dessie Ezez | Asfaw | Arba Minch University | Ethiopia | Chemistry | Analytical Chemistry | worldtopscientists.com |
| Zeinab | Asgari | Isfahan University of Technology | Iran | Agricultural and Biological Sciences | Animal breeding | worldtopscientists.com |
| Ilnaz | Ashayeri | Birmingham city university | United Kingdom | Other | Construction | worldtopscientists.com |
| Muhammad | Asif | Government College University Faisalabad | Pakistan | Chemical Engineering | Medicinal chemistry and Chemical biology | worldtopscientists.com |
| Muhammad | Asif | Shenzhen University | China | Energy | Solar energy | worldtopscientists.com |
| MURAT | AŞIK | ISTANBUL MEDENIYET UNIVERSITY | Turkey | Health Professions | INTERVENTIONAL RADIOLOGY | worldtopscientists.com |
| Alireza | Asle Zaeem | Nuclear science and technology research institute (NSTRI) | Iran | Physics and Astronomy | Fusion engineering | worldtopscientists.com |
| Francesco | Asnicar | Department CIBIO, University of Trento, Italy | Italy | Immunology and Microbiology | human gut microbiome; metagenomics; micro-eukaryotes; Blastocystis | worldtopscientists.com |
| Mohamed-Zakaria | Assani | University of Medicine and Pharmacy of Craiova | Romania | Immunology and Microbiology | Immunology | worldtopscientists.com |