Dr. Siddiqi has served as Assistant Professor in the Division of Emergency Room Medicine, Department of Surgery, and as Assistant Professor/Hospitalist in the Department of Internal Medicine at the University of Texas Medical Branch in Galveston. He is a member of the American Society of Therapeutic Radiation and Oncology, Radiological Society of North America, American Medical Association, Texas Medical Association and American College of Physicians.

Dr. Siddiqi is especially interested in Intensity-Modulated Radiation Therapy (IMRT) and Brachytherapy. In his spare time, Dr. Siddiqi enjoys reading, traveling, and spending time with his family.