Wellstar Family Medicine

William Porter, MD, is a board-certified family medicine physician who provides primary care for adults age 18 and older at Wellstar Family Medicine in Holly Springs. He is passionate about helping patients take charge of their health through preventive care and personalized treatment for both physical and mental wellness.

Dr. Porter has special interests in men’s and women’s health, depression, and anxiety. He focuses on creating an open, supportive environment where patients feel heard and empowered to make informed decisions about their care.

Dr. Porter earned his bachelor’s degree in mathematics and computer science from Oglethorpe University in Atlanta and his medical degree from Ross University School of Medicine in Dominica, West Indies. He completed his internship and residency through Temple University’s program at St. Francis Hospital in Wilmington, Delaware, where he also served as chief resident.

He is a member of the American Medical Association, the American Academy of Family Physicians, and the Georgia Academy of Family Physicians.

Dr. Nathan Kaller is a board-certified family medicine physician who provides primary care for adults age 18 and older at Wellstar Family Medicine. He is dedicated to helping patients improve their overall well-being through preventive care and personalized treatment plans that address both physical and mental health.

Dr. Kaller treats a variety of conditions, with special interests in men’s and women’s health, depression, and anxiety. He values open communication and works collaboratively with each patient to support a healthy, balanced lifestyle.

Dr. Kaller earned his bachelor’s degree in microbiology and cell science from the University of Florida and his medical degree from the Philadelphia College of Osteopathic Medicine in Suwanee, Georgia. He completed his family medicine residency at Lakeside Medical Center in Belle Glade, Florida.

Dr. Kaller is a member of the American Osteopathic Association and the American College of Osteopathic Family Physicians.

Sydney Colon, NP-C, is a board-certified family nurse practitioner who provides primary care for adults age 18 and older at Wellstar Family Medicine in Holly Springs. She is dedicated to helping patients achieve their best health through preventive care, patient education, and compassionate support.

Ms. Colon earned her bachelor’s degree in biology from Florida Atlantic University and her bachelor’s degree in nursing from Mercer University’s Georgia Baptist College of Nursing. She went on to complete her master’s degree in nursing at Simmons University in Boston, Massachusetts.

An active member of Sigma Theta Tau International Honor Society of Nursing and the Society for Collegiate Leadership and Achievement, Ms. Colon is passionate about lifelong learning and professional excellence. She is bilingual in English and Spanish, and she welcomes new patients and accepts most insurance plans.

In her spare time, Ms. Colon enjoys playing the violin and drums.

Dr. James Donohue is a board-certified family medicine physician who provides comprehensive care for patients age 12 and older at Wellstar Family Medicine in Holly Springs. He is passionate about helping individuals and families achieve better health through preventive care, chronic disease management, and a personalized approach to wellness.

Dr. Donohue earned his bachelor’s degree from Northeast Louisiana University and his medical degree from Louisiana State University Medical Center in Shreveport. He completed his residency in family medicine at the University of Alabama in Tuscaloosa.

A Fellow of the American Board of Family Physicians and the American Academy of Anti-Aging, Functional and Regenerative Medicine, Dr. Donohue is also a member of the American Medical Association, the American Academy of Family Physicians, and the American Society of Bariatric Physicians.

Outside of work, Dr. Donohue enjoys fishing, exercising, and traveling.

Dr. Donish Siddiqi is a board-certified family medicine physician who provides compassionate, personalized care for patients aged 10 and older. Inspired by his family’s legacy in healthcare, Dr. Siddiqi chose to dedicate his life to medicine and enjoys caring for patients through every stage of life.

He values one-on-one connections and takes time to listen, ensuring each patient feels heard and supported. Dr. Siddiqi focuses on preventive care, wellness exams, and managing a wide range of acute and chronic conditions for children and adults alike.

Dr. Siddiqi welcomes new patients and accepts most insurance plans. In addition to English, he also speaks Hindi.