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Our Staff


Dr. David M. Johnson Pathology Associates of Central Illinois

Nathaniel Patterson, M.D.

Joined PACI  in 2014

Dr. Patterson grew up in Indianapolis, Indiana where he studied Biology and Chemistry at Indiana University-Purdue University Indianapolis.  He earned his medical degree from The American University of The Caribbean and competed residency in Anatomic Pathology and fellowships in Forensic Pathology and Pediatric Pathology at the University of Texas-Southwestern.  He is board certified in Anatomic Pathology and Forensic Pathology.  Dr. Patterson specializes in Autopsy Pathology with special interests in Forensic Pathology and Perinatal Pathology.  In his free time he enjoys auto racing and dog training.  


Pathology Associates of Central Illinois Chairpersons:

Mark Clarke, M.D.
Laboratory Director
Decatur Memorial Hospital   

John Z. Gao, MD, PhD,   
Laboratory Director
Memorial Medical Center     

Yan Chen, M.D.
Laboratory Director
Passavant Area Hospital 

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