About Me

Dr. Ibrahim Hajjali received his medical degree from University College Dublin, Ireland and is certified by the Educational Commission for Foreign Medical Graduates (ECFMG). After graduating medical school, he went on to complete a Master's in Stem Cell Biology and Regenerative Medicine at the University of Southern California Keck School of Medicine. He then completed his residency training at the Penrose-St. Francis Pathology Program, followed by fellowship training in hematopathology and molecular genetic pathology at Oregon Health & Science University. He is board certified in anatomic and clinical pathology, hematopathology, and molecular genetic pathology by the American board of Pathology. 

Before embarking on his medical career, Dr. Hajjali was involved in many successful research projects including ecology, pharmaceutical drug development, stem cell biology, and molecular biology. He is certified in bio-technology and cell culture techniques and his leadership and hard work has been well recognized.  Dr. Hajjali's current interests are in the field of stem cell biology and regenerative medicine.

Education & Training


Molecular Genetic Pathology Fellow

Oregon Health & Science University2022  - 2023

Hematopathology Fellow

Oregon Health & Science University2021  - 2022

Anatomic & Clinical Pathology Resident

Penrose-St. Francis Health Services2017  - 2021

Master of Science in Stem Cell Biology & Regenerative Medicine

University of Southern California, Keck School of Medicine2015  - 2016

Medical Degree - Medicinae Baccalaureus (MB), Baccalaureus Chirurgiae (BCh), & Baccalaureus in Arte Obstetricia (BAO)

University College Dublin School of Medicine2010  - 2014

Bachelor of Science in Molecular Biology

University of California, San Diego2007  - 2009

Associate of Arts

Pasadena City College2002  - 2007

Recent Publications


Median raphe cyst: A clinically challenging diagnosis

C Hajar, IR Hajjali, L Oscar, and DC Mayes. Clin Pract. Aug 2019; 9 (3): 1176.

Smek1/2 is a Nuclear Chaperone and Cofactor for Cleaved Wnt Receptor Ryk, Regulating Cortical Neurogenesis. 

WH Chang, SH Choi, BS Moon, M Cai, J Lyu, J Bai, F Gao, I Hajjali, et al.  PNAS. Dec 2017; 114 (50): E10717-E10725. 

Neural Crest Cell Implantation Restores Enteric Nervous System Function and Alters the Gastrointestinal Transcriptome in Human Tissue-Engineered Small Intestines. 

CR Schlieve, KL Fowler, M Thornton, S Huang, IR Hajjali, X Hou, B Grubbs, JR Spence, TC Grikscheit. Stem Cell Reports. Sep 2017; 9 (3): 883-896.

Human Stem Cell-Derived Neural Crest Cells Restore Neurons and Glia in Hirschsprung Disease Colon.

CR Schlieve, KL Fowler, IR Hajjali, X Hou, TC Grikscheit.Academic Surgical Congress (ASC). Feb 2017; 62.10, p93

Regeneration of Villus-Like Structures in Human and Murine Tissue-Engineered Intestine Occurs Through Smooth Muscle-Independent Reactivation of Villus-Cluster Gene Expression

CR Schlieve, K Schall, KL Fowler, IR Hajjali, X Hou, TC Grikscheit.Journal of the American College of Surgeons. Oct 2016; Volume 223 (4), S147 - S148

Professional Reviews

Selected Works

Molecular Pathology and Cytogenetics I: Foundations [Online Lecture]

Molecular Pathology and Cytogenetics II: Analytical Techniques [Online Lecture]

Chimeric Antigen Receptor T Cells (CAR-T cells) [Online Lecture]

Hemoglobinopathies [Online Lecture]

RYK/Aurora Interaction May Play a Role in Asymmetric Cell Division

Significance of VerifyNow P2Y12 & VerifyNow ASA in Management of Neurovascular Disease: A Case Study

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"The greatest obstacle to discovery is not ignorance - it is the illusion of knowledge." 

- Daniel J. Boorstin