Meet our Immunogenetics Team 

The Immunogenetics laboratory’s skilled and fully-accredited team includes a director, a supervisor, and four full-time technologists. 

S. Yoon Choo, MD
Director 
Dr. Choo is an ASHI-approved HLA laboratory director in the categories of hematopoietic stem cell transplantation and solid organ transplantation. Having joined the Mount Sinai Health System in 2001, he is also a clinical pathologist by training and a practicing transfusion medicine physician. 

Oksana Gudzowaty, CHS 
Supervisor 
ASHI-certified at the highest level of Histocompatibility Specialist (CHS), Oksana Gudzowaty works closely with the stem cell transplant team to expedite and facilitate HLA matched donor searches. She has served as supervisor since 2001.