Dr. John Simpson

Dr. Saini joined faculty of the Division of Allergy & Clinical Immunology immediately following his fellowship in 1997. He has served as the principal investigator and co-investigator for basic and translational studies examining the role of IgE receptor expression and activation in allergic airways disease, anaphylaxis, and chronic urticaria. His research has been supported by the NIH, American Lung Association, and the AAAAI. He is the Program Director for our allergy and immunology fellowship program since 2008. Dr. Saini is rated as a Distinguished provider by MediFind in the treatment of Hives. His top areas of expertise are Chronic Spontaneous Urticaria (CSU), Hives, Angioedema, and Acute Eosinophilic Pneumonia.

Eric Oliver, M.D. joined the Division of Allergy and Clinical Immunology as an instructor of medicine in July 2015. Dr. Oliver was born and raised in South Carolina and graduated from Duke University as dual major in biology and religion and a music minor. He earned his M.D. from the University of South Carolina and completed his residency in internal medicine and pediatrics from The Ohio State University. He completed his fellowship in allergy and immunology at Johns Hopkins. Dr. Oliver evaluates and treats infants, children, and adults at the Johns Hopkins Asthma & Allergy Center located on the Bayview campus. His clinical interests include allergic disorders of the skin and airway, hives (urticaria), food allergy, anaphylaxis, immunotherapy, aspirin desensitization, and novel therapeutics. His research efforts focus on elucidating the mechanisms for cell activation and recruitment in allergic skin disorders. Dr. Oliver is rated as a Distinguished provider by MediFind in the treatment of Hives. His top areas of expertise are Chronic Spontaneous Urticaria (CSU), Hives, Mast Cell Activation Syndrome (MCAS), and Asthma.

Hidayat Khan is an Allergy and Immunologist in Columbia, Maryland. Dr. Khan is rated as a Distinguished provider by MediFind in the treatment of Hives. His top areas of expertise are Hives, Sinusitis, Allergic Rhinitis, and Allergic Conjunctivitis.