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Channahon Healthcare Center

Channahon Healthcare Center

25259 Reed St.
Channahon, IL 60410
(815) 467-0555

Office hours (vary by physician):
Mondays: 8 a.m.-6 p.m.
Tuesdays: 8 a.m.-6 p.m.
Wednesdays: 8 a.m.-6 p.m.
Thursdays: 8 a.m.-6 p.m.
Fridays: 8 a.m.-5 p.m.
Saturdays: 8 a.m.-12 p.m.

Same day appointments for immediate needs.

Click here for the Center for Disease Control’s recommended immunization schedule!


Mary Connolly, M.D., Family Medicine

As a family medicine physician, Dr. Mary Connolly is specially trained to care for patients of all ages, from babies to seniors, including preventive care, routine check-ups, health risk assessments, immunizations, screening tests, and personalized counseling on maintaining a healthy lifestyle. She is committed to providing top quality care for her patients, along with clinical excellence and compassion.

Dr. Connolly received her medical degree at The Rosalind Franklin School and Medicine and Science/The Chicago Medical School and completed a residency at MacNeal Family Medicine Residency Program in Berwyn, IL.

When she's not taking care of patients, Dr. Connolly enjoys spending time with her friends and family (specifically, spoiling her nieces and nephews!). Dr. Connolly has a personal interest in becoming more proficient in Spanish.

Jennifer Greggain, N.P., Family Nurse Practitioner

As a family nurse practitioner, Jennifer Greggain is qualified to serve as the primary healthcare provider for patients of all ages. She encourages patients to be actively involved in their healthcare decisions.

Jennifer received her Master's of Nursing Family Nurse Practitioner degree from University of St. Francis in Joliet. She enjoys spending time with family, reading, gardening and staying physically active.

Nuzhat Chalisa, M.D., Endocrinology

Medical conditions associated with the glands and hormones often require the expertise of a physician who specializes in the endocrine system. Dr. Nuzhat Chalisa provides diagnosis and treatment of diabetes, thyroid disorders, osteoporosis, obesity and pituitary problems. She believes in the principle of "Act on Diabetes Now," which provides a multi-systemic approach to the promotion of diabetes education as a core component of diabetes care. Dr. Chalisa is committed to providing excellence in the care of diabetes and other endocrine disorders.

Dr. Chalisa completed her residency at Loyola University Medical Center and a fellowship in endocrinology at Rosalind & Franklin University of Health Sciences/Chicago Medical School. She is board certified in internal medicine and endocrinology.

A resident of Naperville, Dr. Chalisa is married and has two children. She enjoys traveling and interior decorating and is fluent in English, Urdu, Hindi, and Gujrati.

Janet Leon, M.D., Rheumatology

Dr. Janet Leon specializes in the diagnosis, management and treatment of musculoskeletal and rheumatic disease, including bursitis, gout/pseudogout, lupus and related diseases, osteoarthritis, psoriatic arthritis and rheumatoid arthritis. Many of these conditions are characterized by joint pain and inflammation, as well as muscle soreness and stiffness. Dr. Leon is committed to providing compassionate care to patients 18 and older.

Dr. Leon is a graduate of University of Illinois at Chicago. She completed a residency and fellowship at the University of Illinois Hospital in Chicago. Dr. Leon is board certified in internal medicine and rheumatology.

When she's not taking care of patients, Dr. Leon enjoys reading and spending time with her family. She is fluent in English and Spanish.


For your convenience, please print out and complete a Registration and Medical & Family History form before coming in for your first office visit.