There, he made a seminal discovery implicating clathrin mediated trafficking of growth factor receptor tyrosine kinases in the pathogenesis of oncogenic transformation. He then combined clinical training in the pathology of hematologic diseases with further research training in the laboratory of Nobel laureate David Baltimore at Caltech. His research came to focus on the involvement of microRNAs in hematologic development, particularly B-cell development and immunity, and cancer, and resulted in several high-impact publications in well-regarded journals. His research interests include how microRNAs and other non-coding RNAs regulate hematopoietic development and cancer. He combines running a vibrant research laboratory with a busy diagnostic service in leukemia and lymphoma pathology.