Meet Our Doctors

Meet the Specialists Who Will Change the Way You Live with Allergies.

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Meet the Specialists Who Will Change the Way You Live with Allergies.

Our board-certified physicians and advanced practice providers bring decades of combined expertise — and genuine care — to every patient relationship.


At Associated Allergists and Asthma Specialists, you are in the hands of some of the most thoroughly trained allergy and immunology specialists in the Illinois suburbs. Every physician on our team is a pediatrician or internist with additional fellowship training in allergy and immunology — the subspecialty credential that means they have dedicated their careers to understanding how the immune system responds to allergens, and how to correct it.

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Alan H. Resnick, M.D.

Dr. Resnick received his medical training at the University of Illinois College of Medicine and completed his residency in pediatrics at the former Children's Memorial Hospital in Illinois — one of the most highly regarded pediatric programs in the country. He then completed his fellowship in allergy and immunology at Children's Memorial Hospital and Northwestern University. Dr. Resnick is board-certified by both the American Board of Pediatrics and the American Board of Allergy and Immunology. He is a fellow of the American Academy of Pediatrics and the American Academy of Allergy, Asthma, and Immunology.

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Mark Lowenthal, M.D.

Dr. Lowenthal trained at Northwestern University, where he completed his residency in internal medicine and rose to the distinction of chief medical resident at Northwestern Memorial Hospital. He then completed his fellowship in allergy and immunology at Northwestern and Children's Memorial Hospital. Dr. Lowenthal is certified by both the American Board of Internal Medicine and the American Board of Allergy and Immunology. He is also a fellow of the American College of Physicians and the American Academy of Allergy, Asthma, and Immunology.

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Bella Lerman, D.O.

Dr. Lerman received her medical degree from Nova Southeastern University and completed her residency in pediatrics at Marshfield Clinic in Marshfield, Wisconsin. She then pursued fellowship training in allergy and immunology at the Medical College of Wisconsin in Milwaukee. Dr. Lerman is a member of the American Academy of Pediatrics, the American Academy of Allergy, Asthma, and Immunology, and the American College of Asthma, Allergy, and Immunology, she has a special passion for caring for both children and adults with asthma, hives, food allergy, hay fever, chronic sinusitis, chronic cough, and insect and drug allergies.

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Meredith Lacaillade, APRN

Meredith received her Master of Science in Nursing from Case Western Reserve University in Cleveland, Ohio and worked as a registered nurse at University Hospitals of Cleveland before transitioning to her nurse practitioner career. She began in family medicine and has specialized in asthma and allergy since 2012. As an advanced practice nurse, Meredith is fully qualified to diagnose, prescribe medication, and manage asthma and allergic conditions for patients of all ages. She is a compassionate and experienced clinician who plays an integral role in our patients' ongoing care.

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Our team is ready to see you. 


Contact us today to schedule your first appointment at our Barrington or Highland Park office.

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