Dr. Sheikh is certified by the American Boards of Internal Medicine, Geriatrics, Haematology, and Medical Oncology. He has expertise ranging from the diagnosis, and treatment of the benign and malignant disorders of the blood cells, lymph nodes, and bone marrow such as lymphoma, leukaemia, and myeloma as well as tumours of the breast, lung, colon, rectum, prostate, kidneys, urinary bladder, oesophagus, stomach, pancreas, ovaries among many others. In addition, Dr. Sheikh has a special focus on the management of older people with cancer requiring a comprehensive assessment. His research interests include clinical trials of novel agents, outcomes research, and geriatric oncology.