Alexa Fider-Whyte, Pa-C

Dr. Carlos Portales Castillo is an infectious disease specialist who provides consultations - both inpatient and outpatient - for patients ages 18 and older. Some of the infectious diseases he has treated include actinomycosis, osteomyelitis, and Lyme disease. He also specializes in transplant infectious diseases. Dr. Portales Castillo provides the best, most up-to-date, evidence-based care for patients, particularly those with complicated infections and compromised immune systems. Dr. Portales Castillo is an assistant professor with the Division of Infectious Diseases, Allergy & Immunology in the Department of Internal Medicine at Saint Louis University School of Medicine.

Dr. George Thieroff is a rheumatologist who sees pediatric and adult patients of all ages with complex rheumatologic conditions. He diagnoses and treats various conditions, including juvenile idiopathic arthritis (JIA) and rheumatoid arthritis (RA), which affect the joints, muscles, bones, and connective tissues, causing pain and inflammation. Dr. Thieroff is an assistant professor with the Division of Rheumatology in the Department of Internal Medicine at Saint Louis University School of Medicine.

Dr. Gillian Heinecke treats patients who have skin cancer, psoriasis, eczema, complex medical skin conditions, acne, and warts. Her areas of expertise include psoriasis and dermatopathology. She applies the latest dermatologic advancements in her treatment plans, such as immunosuppressive and biologic therapies.Her research interests include dermatopathology and medical education.Dr. Heinecke is an assistant professor in the Department of Dermatology at Saint Louis University School of Medicine. She is the associate director of the department's residency program.Professional memberships include the American Academy of Dermatology and the American Society of Dermatopathology.