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Availability last updated 04/30/2025
Gregory O. Clark, MD, is an experienced diabetes specialist. He treats patients at Chicago Diabetes Experts located in Buffalo Grove, Illinois. Dr. Clark was diagnosed with Type 1 diabetes at 11 years old, motivating his professional career.
As a teenager, he was rebellious and not well-controlled. In fact, Dr. Clark used to hide bags of Reese's Peanut Butter Cups under his bed and drink milkshakes and apple pies before school. As he grew up, he focused on getting his diabetes under control, eating a healthy diet, and exercising almost every day.
Dr. Clark studied biochemistry in college at the University of California San Diego. He then attended medical school at the University of Southern California in Los Angeles, graduating with the highest distinction.
Dr. Clark first became interested in diabetes-related research and clinical care in medical school. After graduating, he completed his residency in internal medicine and fellowship in endocrinology, diabetes, and metabolism at Johns Hopkins Hospital in Baltimore, Maryland.
Dr. Clark eventually joined the medical school faculty at Johns Hopkins. There, he conducted stem cell research with the hope of curing diabetes and was part of a team that was among the first two groups in the world to make an unlimited supply of stem cell derivatives that produce insulin in response to changing blood glucose levels.
Dr. Clark remained in academic medicine for over a decade, doing diabetes-related research, teaching, and clinical care before founding Chicago Diabetes Experts in 2013. At the practice, Dr. Clark's goal is to help each patient understand how best to manage their own diabetes while supporting the individual as they work together to find the calm in this disease storm.
Dr. Clark wants to help you become your own diabetes expert!
Dr. Gregory Clark, MD
Endocrinologist
355 W Dundee Rd
Suite 110
Buffalo Grove, IL 60089
Andrew Ivanchenko, MD
Family Physician
985 S. Buffalo Grove Rd
Buffalo Grove, IL 60089
Albert Mensah, MD
Family Physician
4326 West Montrose Ave
Chicago, IL 60641
Judith Bowman, MD
Family Physician
4320 West Montrose Avenue
Chicago, IL 60641
Irina Harag, MD
Family Physician
1666 Checker Rd
Lake Zurich, IL 60047
Jacob Luka, PA-C, is a board-certified physician assistant at Cermak Immediate Care, proudly serving patients in Cicero and the neighborhood of Marshall Square in Chicago, Illinois. With a commitment to providing compassionate, efficient, and high-quality care, he strives to make a meaningful impact on his patients’ health and well-being.
His clinical expertise spans both urgent care and emergency medicine. He earned dual Bachelor of Science degrees in neurobiology and psychology from the University of Wisconsin–Madison before completing his Master of Science in Physician Assistant Studies at Ohio Dominican University in Columbus, Ohio. Now board-certified, Jacob specializes in urgent care and emergency medicine, delivering prompt and comprehensive treatment to patients in need.
A Chicagoland native, Jacob is passionate about giving back to his community. He values patient-centered care, actively listening to his patients and incorporating shared decision-making to ensure the best possible outcomes.
To schedule an appointment with Jacob and the team at Cermak Immediate Care, call the nearest office or book online today.
Jacob Luka, PA-C
Physician Assistant
2408 W Cermak Rd
Chicago, IL 60608
Alvina Shaikh, PA-C, is a board-certified physician assistant at Cermak Immediate Care, serving patients in Hoffman Estates, Rolling Meadows, and Mount Prospect, Illinois. She is dedicated to providing high-quality, compassionate care for both adults and children.
A graduate of Midwestern University, Alvina specializes in women's health and the management of chronic conditions, including diabetes and hypertension. She has also conducted extensive research on gynecologic malignancies, such as breast and ovarian cancers.
Outside of her work at Cermak Immediate Care, she enjoys cooking and spending quality time with family and friends.
To schedule an appointment with Alvina and the team at Cermak Immediate Care, call the office or book online today.
Alvina Shaikh, PA-C
Physician Assistant
2408 W Cermak Rd
Chicago, IL 60608
Andrea Seney, PA-C, is a board-certified physician assistant at Cermak Immediate Care, proudly serving patients in Cicero and the neighborhood of Marshall Square in Chicago, Illinois.
She earned her bachelor’s degree in biology with a minor in chemistry and a pre-med concentration from Merrimack College. Before pursuing her physician assistant studies at Seton Hall University, she gained valuable hands-on experience as a patient care associate at Massachusetts General Hospital, further refining her clinical skills.
With a well-rounded background in medicine, Andrea is skilled in diagnosing and managing both acute and chronic conditions. She works closely with physicians, medical assistants, and other healthcare professionals to provide comprehensive, patient-centered care—emphasizing education and preventive health strategies.
Recognized for her compassionate nature, strong communication skills, and dedication to improving patient outcomes, Andrea is committed to fostering a positive healthcare experience for every patient she treats.
When she’s not in the clinic, Andrea enjoys staying active on the soccer field and spending quality time with her family and her golden retriever.
To schedule an appointment with Andrea and the team at Cermak Immediate Care, call the nearest office or book online today.
Andrea Seney, PA-C
Physician Assistant
2408 W Cermak Rd
Chicago, IL 60608
