Internal Medicine and Allergy Physicians

Meet our Practice of University-trained and Board-certified Internists and Allergist

Internal Medicine

Allergy, Asthma, and Immunology


Sheila D. Ballintine, MD

Sheila D. Ballintine, MD received a bachelors of science in Biology from Boston College. She returned to her home state of New Jersey to complete her medical degree at Rutgers- Robert Wood Johnson Medical School. She then came to Chicago where she completed her training in Internal Medicine at Northwestern University, where she also completed the Women’s Health Track. Her clinical interests include women’s health, preventive medicine, and diet and weight-management counseling.

 

Angelo A. Costas, MD

Angelo A. Costas, MD graduated from Loyola University Chicago, prior to attending Loyola University - Stritch School of Medicine. He went on to complete his residency training in Internal Medicine at Northwestern University where he had the distinction of spending an additional year as Chief Resident of the Internal Medicine program. He currently holds a faculty appointment at Northwestern University – Feinberg School of Medicine as an Assistant Professor of Medicine. His special interests include preventive medicine and hypertension. His practice is a concierge practice which significantly limits the number of patients in his practice. Please contact the office for specific information. 

 

Ami P. Desai, MD

Ami P. Desai, MD completed her undergraduate training at Northwestern University where she received degrees in Psychology and Biology. She received her medical degree from the University of Illinois-Chicago. She completed her residency training in Internal Medicine at Northwestern University where she also had the distinction of spending an additional year as Chief Resident of the Internal Medicine program. She currently holds a faculty appointment at Northwestern University – Feinberg School of Medicine as a Clinical Instructor of Medicine. Her clinical interests include preventive medicine and patient education.

 

Greg D. Ewert, MD

Greg D. Ewert, MD received a bachelors of science in Biology from the University of Illinois. He stayed with the University of Illinois for his medical school training. He completed his training in Internal Medicine at Northwestern University where he spent an additional year completing a fellowship in Sports Medicine. He currently holds a faculty appointment at Northwestern University – Feinberg School of Medicine as an Assistant Professor of Clinical Medicine. Dr. Ewert believes in comprehensive medical care of patients with a focus on optimizing health through diet, exercise, and other preventive measures. His practice is a concierge or retainer practice which significantly limits the number of patients in his practice. Please contact the office for specific information. 

 

Louis Hiotis, MD

Louis Hiotis, MD completed his undergraduate degree in Biochemistry from Benedictine University. He received his medical degree from Loyola University-Stritch School of Medicine. He then completed a four-year residency in the Combined Internal Medicine and Pediatrics program from the University of Illinois Hospital in Chicago, serving as chief resident during his final year. Board certified in both Internal Medicine and Pediatrics, Dr. Hiotis can see patients of all ages. Currently, however, he limits his practice to those age 14 and older. He currently holds a faculty appointment at Northwestern University – Feinberg School of Medicine as an Assistant Professor of Medicine. His special interests include sports medicine, preventive medicine, hypertension, and cardiovascular disease.

 

Evan Ng, MD

Evan Ng, MD Internist in Chicago

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Evan Ng, MD, received both his undergraduate and medical degrees through the Northwestern University Honors Program in Medical Education. He completed his residency training in Internal Medicine at the Northwestern University Feinberg School of Medicine, where he now holds a faculty appointment as a Clinical Instructor. Dr. Ng believes in preventive care and emphasizes a healthy lifestyle through good nutrition and exercise. His clinical interests also include men's health, LGBT health, travel medicine, and sexually transmitted infections.

 

Shirley L. TerMolen, MD

Shirley L. TerMolen, MD received her bachelor’s degree in English Literature from Dartmouth College. She completed her medical training at Ohio State University – College of Medicine. She then came to Chicago where she completed her Internal Medicine training at Northwestern University. Her special interests include well woman care and preventive medicine.

 

David A. Vermylen, MD

David A. Vermylen, MD Internist in Chicago

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David A. Vermylen, MD graduated from Princeton University prior to attending Northwestern University's Feinberg School of Medicine. He completed his medical residency at Northwestern, where he had the distinction of serving as Chief Resident for the Internal Medicine program. His clinical interests include preventive care and wellness counseling for men and women of all ages, as well as providing primary care for adults with common and uncommon chronic conditions.


Bradley R. Sabin, MD

Bradley R. Sabin, MD completed his undergraduate degree at the University of Illinois prior to attending the Northwestern University-Feinberg School of Medicine. He completed his residency training in Internal Medicine at Northwestern University where he had the distinction of spending an additional year as Chief Resident of the Internal Medicine program. Dr. Sabin then completed a two-year fellowship in Allergy & Immunology at Northwestern University and Children’s Memorial Hospital. He currently holds a faculty appointment at Northwestern University – Feinberg School of Medicine as a Clinical Instructor of Medicine. He is board certified in both adult and pediatric allergy & immunology and internal medicine. Dr. Sabin sees both adults and children in allergy & immunology in addition to adults in internal medicine. His special interests include asthma, nasal allergies, sinus disease, chronic cough, hives, and drug and food allergies.