Meet the Doctors

About Asthma & Allergy Clinic

Asthma & Allergy Clinic provides high-quality specialized medical care to allergy and asthma sufferers of all ages. We provide individualized action plans for the management of asthma, allergic rhinitis, and food allergies. Visit us at 109 Millsaps Drive, Suite C or call us at 601-268-5051.

Take a minute to get acquainted with our doctors, and then feel free to give us a call and schedule your appointment. We also provide walk-in appointments. We have over 87 years of combined experience. Dr. Kathryn Lindsey McMullan has recently joined our team. She's the founding member of the Mississippi Society for Allergy, Asthma and Immunology as well as a member of Southeastern Allergy, Asthma and Immunology Society.

Dr. William B. Sullivan

Dr. Sullivan, a native of Bessemer, Alabama, is board certified by the American Board of Allergy & Immunology and the American Board of Pediatrics. Dr. Sullivan graduated from the University of Alabama School of Medicine.

He had his residency in pediatrics at the University of Tennessee School of Medicine. He holds a fellowship in allergy and immunology at the Louisiana State University School of Medicine. He has been in this field since 1987. He's an avid sports fan.

Dr. Kathryn Lindsey McMullan

Dr. Kathryn Lindsey McMullan received her undergraduate degree via a Study Abroad Program at Liverpool Hope University College in Liverpool, England. She graduated summa cum laude from the University of Mississippi, Oxford campus. 

After completing her Doctor of Medicine cum laude at the Medical School, she completed her residency at the University of Mississippi School of Medicine. She received her allergy and immunology fellowship training from the Washington University School of Medicine in St. Louis, Missouri.

Dr. Kathryn is presently a member of FADDA within the American Academy of Allergy, Asthma and Immunology. She is also a committee member for Billing/Coding and Practice Management within the American College of Allergy, Asthma and Immunology.

She's the founding member of the non-profit organization, Mississippi Society for Allergy, Asthma and Immunology, where she's currently serving as the secretary of the organization. Learn more about Dr. Kathryn and the organization's work. Take a look at their FB page.

She's got an incredible research experience under her belt that covers almost 20 different topics she either investigated or sub investigated during her studies. She has published journal articles, books and chapters on the subjects of allergies, rhinitis, sinusitis, insect allergies, aspirin allergies, hypertension, red meat allergies, and other very important subjects. 

Outside of the office she enjoys spending time with her husband and 3 kids, including a set of twins! They reside in Hattiesburg, Mississippi.
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Our Mission

  • To serve as an advocate for patients with allergic, asthmatic, and immunological disorders in the state of Mississippi
  • To promote and encourage the study of allergy, asthma, and clinical immunology and to educate its practitioners 
  • To disseminate pertinent knowledge among professionals and lay public
  • To promote and encourage research in allergy and related disciplines
  • To cooperate with other organizations and agencies in any area relating to the practice or study of allergy, asthma, and immunological diseases
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Our Licenses and Certifications

  • Mississippi Medical License - Mississippi Board of Medicine Licensure
  • Certified by the American Board of Internal Medicine 
  • Certified by the American Board of Allergy and Immunology
  • United States Medical Licensing Examination (USMLE)
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