Dr. Kumar received his medical degree from L.T.M. Medical College, Mumbai, India, his PhD in anatomy and cell biology from the University of Iowa, pediatric residency training at the Mayo Clinic and fellowship in pediatric hematology / oncology / BMT at the University of Minnesota. He was appointed to the faculty of the University of Minnesota in the Department of Pediatrics where he was a member of the programs in pediatric leukemia and global pediatrics. He is currently an associate professor of pediatrics in the Division of Bone Marrow Transplantation and Immune Deficiency at Cincinnati Children's within the University of Cincinnati College of Medicine. Dr. Kumar’s laboratory is engaged in researching the biology of infant leukemia. Discoveries made in his laboratory have significantly enhanced the current understanding of leukemia. Dr. Kumar is also active in education. He has delivered invited lectures and grand round presentations on various topics.

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Dr. Kumar has been elected by peers for inclusion in the Best Doctors in America List.