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- Clinical Professor of Medicine, Division of Allergy and Immunology, Rutgers- New Jersey Medical School, Newark, New Jersey
- Associate Professor of Internal Medicine, Division of Allergy and Immunology, Saint Louis University School of Medicine; Director, Nasal and Paranasal Sinus
- Research Laboratory; Co-Director, Comprehensive Sinus Clinic; Assistant Professor of Otolaryngology
- Attending Physician, Saint Louis University Hospital, St. Louis, MO; Consultant, John Cochran VA Medical Center, St. Louis, MO; Attending Physician, Cardinal Glennon Children’s Hospital, St. Louis, MO; Medical provider for 8 HMO/PPO groups
- Junior Attending Physician, Washington Hospital Center, Washington, DC
- Consultant, Monell Chemical Senses Center, Philadelphia, PA
- Consultant in allergy to NIH/NIAID extramural programs