John M. Sultan, MD, an internal medicine physician at Endeavor Health, provides primary care for adults with an emphasis on integrative medicine. He combines conventional treatments with evidence-based complementary approaches to support patients’ overall health and long-term wellbeing. Dr. Sultan is rated as an Advanced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Irritable Bowel Syndrome (IBS), Chronic Cough, Coronary Heart Disease, and Atrioventricular Nodal Reentrant Tachycardia (AVNRT).

Gary Kaufman, MD, an internal medicine physician at Endeavor Health, provides primary care for adults with a focus on prevention and long-term relationships. He cares for generations of families and emphasizes continuity, trust and patient education. Dr. Kaufman values building partnerships that support lifelong health and wellbeing. Dr. Kaufman is rated as an Advanced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Glucocorticoid-Remediable Aldosteronism, Hypertension, Familial Hypertension, and Non-Hodgkin Lymphoma.

Shalini Patel is a Nephrologist in Highland Park, Illinois. Dr. Patel is rated as an Advanced provider by MediFind in the treatment of Hypercalcemia. Her top areas of expertise are Chronic Kidney Disease, End-Stage Renal Disease (ESRD), Acute Kidney Failure, and Low Sodium Level.

Karolina Woloszyn Machnica, DO, an endocrinologist at Endeavor Health, provides care for patients with hormonal and metabolic disorders, including diabetes, thyroid disease and adrenal conditions. She works closely with patients to develop individualized treatment plans that support long-term endocrine health. Dr. Machnica is rated as an Advanced provider by MediFind in the treatment of Hypercalcemia. Her top areas of expertise are Hyperparathyroidism, Type 2 Diabetes (T2D), Familial Isolated Hyperparathyroidism, and Osteitis Fibrosa.

Kristina Todorova-Koteva, MD, an endocrinologist at Endeavor Health, provides personalized care for a broad range of hormonal and metabolic conditions. She focuses on patient education and informed decision-making, helping individuals understand their diagnosis and choose the best path forward. Dr. Todorova-Koteva believes that empowered patients are better equipped to improve their health and sustain long-term outcomes. Dr. Todorova is rated as an Advanced provider by MediFind in the treatment of Hypercalcemia. Her top areas of expertise are Type 2 Diabetes (T2D), Diabetic Nephropathy, Triple A Syndrome, and Thyroid Cancer.

Megan Crawford, DO, an endocrinologist at Endeavor Health, provides care for patients with hormonal and metabolic conditions, including diabetes, thyroid disorders and osteoporosis. She develops personalized treatment plans that support patients in managing long-term endocrine health and improving quality of life. Dr. Crawford is rated as an Advanced provider by MediFind in the treatment of Hypercalcemia. Her top areas of expertise are Type 2 Diabetes (T2D), Hyperparathyroidism, Hypothyroidism, and Thyroid Cancer.

Stuart Sprague, DO, a nephrologist at Endeavor Health, brings decades of clinical experience and research to the care of patients with kidney disease. His work spans rare diseases, mineral metabolism and complex diagnostic challenges. Dr. Sprague is known for a patient-centered approach, especially for those who don’t fit typical treatment algorithms, and he continues to explore innovations in dialysis and artificial kidney development. Dr. Sprague is rated as an Elite provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Chronic Kidney Disease, Hypercalcemia, Milk-Alkali Syndrome, Parathyroidectomy, and Kidney Transplant.

Arielle Levitan, MD, an internal medicine physician at Endeavor Health, provides primary care for adults across all stages of life. She emphasizes continuity of care, patient partnerships and personalized health planning. Her clinical interests include preventive medicine, chronic disease management and helping patients navigate healthcare decisions with evidence-based support. Dr. Levitan is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. Her top areas of expertise are Sitosterolemia, Familial Neurocardiogenic Syncope, Hypothyroidism, and Varicose Veins.

Kimberly Schaefer, MD, an internal medicine physician at Endeavor Health, provides primary care for adults with a focus on prevention, education and long-term relationships. She works closely with patients to create care plans based on evidence-based guidelines and personal goals. Dr. Schaefer values trust, communication and continuity of care. Dr. Schaefer is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. Her top areas of expertise are Diarrhea, Trichohepatoenteric Syndrome, Childhood Iron Deficiency Anemia, and Large-Cell Immunoblastic Lymphoma.

Kenneth Breger, MD, an internal medicine physician at Endeavor Health, provides primary care for adults with a focus on prevention and long-term relationships. With nearly 30 years of experience, he values continuity of care and generational connections with families. Dr. Breger also supports lifestyle change and early detection to help patients stay healthy and independent over time. Dr. Breger is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Alzheimer's Disease, Chronic Cough, Large-Cell Immunoblastic Lymphoma, and Vertigo.

Matthew Snowdon, DO, an internal medicine physician at Endeavor Health, provides care for adult patients across a broad range of health concerns. His approach emphasizes long-term relationships and empowering patients to take ownership of their health. With a personal history of navigating the healthcare system as a cancer patient in childhood, Dr. Snowdon brings firsthand perspective to helping patients feel informed, supported and comfortable. He values communication and education as key to achieving meaningful health outcomes. Dr. Snowdon is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Sitosterolemia, Obesity, High Cholesterol, and Obesity in Children.

Daniel Goldstein is a primary care provider, practicing in Internal Medicine in Highland Park, Illinois. Dr. Goldstein is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Heart Failure, Hypertension, Familial Hypertension, Heart Transplant, and Lung Transplant.

David Smiley is a primary care provider, practicing in Internal Medicine in Highland Park, Illinois. Dr. Smiley is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Bronchiectasis, Philadelphia-Negative Chronic Myeloid Leukemia, Chronic Myelogenous Leukemia (CML), and Childhood Acute Myeloid Leukemia.

Mark Greenberger is a primary care provider, practicing in Internal Medicine in Highland Park, Illinois. Dr. Greenberger is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Acute Interstitial Pneumonia, Myeloproliferative Neoplasms (MPN), Heart Failure with Preserved Ejection Fraction (HFpEF), Endoscopy, and Pacemaker Implantation.

Mariamou C. Sims, MD, an internal medicine physician at Endeavor Health, provides primary care for adults with a focus on preventive services and chronic disease management. She works closely with patients to support long-term health and wellness through personalized, evidence-based care. Dr. Sims is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. Her top areas of expertise are Familial Hypertension, Hypertension, Glucocorticoid-Remediable Aldosteronism, and High Cholesterol.

Sanjeev Lulla is a primary care provider, practicing in Internal Medicine in Northbrook, Illinois. Dr. Lulla is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Sitosterolemia, Endocarditis, Chronic B-Cell Leukemia (CBCL), and Chronic Lymphocytic Leukemia (CLL).

Jonathan Brown, MD, an internal medicine physician at Endeavor Health, provides primary and preventive care for adults across all stages of life. With more than 25 years in practice, he prioritizes strong doctor-patient partnerships built on trust, open communication and mutual respect. Dr. Brown aims to create a welcoming, nonjudgmental environment where patients feel heard, safe and empowered to take charge of their health. Dr. Brown is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Temporal Arteritis, Undifferentiated Connective Tissue Disease (UCTD), Alcoholic Cirrhosis, and Visceromegaly.

Sharon Doss, MD, an Internal Medicine physician at Endeavor Health, provides primary care with a strong focus on prevention and lifestyle-related chronic conditions. She sees adult patients and incorporates her training in integrative medicine to help guide patients toward safe, effective and personalized treatment options. Dr. Doss emphasizes collaboration and shared decision-making, empowering patients to be active participants in their health. Dr. Doss is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. Her top areas of expertise are Chronic Cough, Vertigo, Sitosterolemia, and Fainting.

Alina Elperin is a primary care provider, practicing in Internal Medicine and Bariatric Medicine in Bannockburn, Illinois. Dr. Elperin is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. Her top areas of expertise are Adult Still's Disease, Heart Failure with Preserved Ejection Fraction (HFpEF), Chronic Lymphocytic Leukemia (CLL), and End-Stage Renal Disease (ESRD).

David Vigder is a primary care provider, practicing in Internal Medicine in Bannockburn, Illinois. Dr. Vigder is rated as an Experienced provider by MediFind in the treatment of Hypercalcemia. His top areas of expertise are Memory Loss, Childhood Iron Deficiency Anemia, Infant Hyperglycemia, and Maturity Onset Diabetes of the Young.