Prof Dr Umar Saeed is ranked among the top 2% Scientists of world. With more than 15 years' experience, 187 international publications, and over 5000 impact factor with significantly higher cumulative citations in health sciences with following educational background [Post-Doc (S.Kor), PhD (S.Kor), FCR (Harvard USA), FPH (Royls Coll Phy UK), CIEH (UK), IDSR (WHO), DPH (PSEC), CPHE (ICMSR), IPC (WHO), CCRC (USA) GHC (WHO), IPPCR (USA), CGCP (NIDA USA), JRA-OT (WHO), PMP (USA), ICG (WHO), LMO (S.Kor), IMS (WHO), CCTM (USA), TOPIK (S.Kor), PSEA (WHO), STI (PK), PISA (WHO), DRM (WHO), RWE (KARA S.Kor), NSER (KFNSER S.Kor), AMR-NAP (WHO), CMR-IPV (WHO), ACRP-Cert (USA) MS&BS (NUST PK), Member ACRP (USA), Member AGA (USA), Member CDA (USA), Member IHME (USA)]. He is a dedicated scientist with a sound record of multiple applied biomedical research in the world top ranked journals such as Lancet, Nature Science, JAMA Oncology, and several others. His persistence proves him as an expert in Clinical Research, Vaccine Development & Gastrointestinal Oncology. Dr. Umar Saeed is a committed and highly skilled biomedical researcher with a distinguished background in gastrointestinal oncology, particularly focused on Hepatitis B (HBV) and Hepatitis C (HCV)-associated liver disease and hepatocellular carcinoma (HCC). His early research work explored the molecular epidemiology and progression pathways of HBV/HCV infections in high-risk populations in Pakistan, with a strong focus on the oncogenic potential of viral genotypes, liver fibrosis biomarkers, and treatment response variability. Building upon this foundation, Dr. Saeed transitioned into national leadership roles in vaccine trials and clinical research. He served as the Focal Person for Pakistan’s largest Phase III COVID-19 vaccine trial (2020–2022), overseeing over 17,500 participants and coordinating across five major clinical sites. At the National Institutes of Health (NIH), Islamabad, he: Facilitated the development and quality assurance of PakVac, Pakistan’s first COVID-19 vaccine Led establishment of SOPs and infrastructure for NIH’s Clinical Trial Unit Played a central role in mapping vaccine-related GMP capabilities of the country Oversaw serum biomarker processing and real-time PCR laboratory management Contributed to global vaccination efforts, particularly in under-18 populations Dr. Saeed integrates his foundational research in viral-induced GI cancers with his broader commitment to public health and vaccine innovation, making him a prominent contributor to translational medicine in Pakistan and beyond.