Dr. Sen specializes in the diagnosis and treatment of all types of cancers, as well as hematological disorders and conditions. He completed his fellowship in hematology and medical oncology at Hahneann University Hospital/Drexel University College of Medicine in Philadelphia, where he also served as the chief fellow. He fulfilled his internship and residency training, followed by a year as chief resident, at St Luke's Hospital in St. Louis. Additionally, he served as a teaching faculty physician for the internal medicine residency program at SSM Health St. Mary's Hospital - St. Louis. Dr. Sen graduated with his medical degree from the University College of Medical Sciences, University of Delhi in India.

Dr. Sen is board certified in internal medicine, hematology and medical oncology. He holds memberships in the American Society of Hematology and the American Society of Clinical Oncology.