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Our Mid-Level Providers


Ingrid Cantrell, PA

Ingrid Cantrell joined Allergy & Asthma Care in July 2008. She received her Masters in Science with a Physician Assistant degree from Trevecca Nazarene University in Nashville, Tennessee and is licensed in Tennessee and is Board eligible. Ms. Cantrell has also received a Masters Degree in Public Health from the University of South Florida. She is now specializing in adult and pediatric allergy, asthma, and clinical immunology.

She is a member of the American Academy of Physician Assistants, the Tennessee Academy of Physician Assistants, and the TSAAI. Ms. Cantrell is bilingual and speaks fluent Spanish.


Marcia Johnston, ARPN-BC, FNP

Marcia Johnston has served the Memphis area as a Nurse Practitioner with Allergy and Asthma Care since 1997. She received her Masters of Science in Nursing from the University of Memphis, is a Board Certified Nurse Practitioner, and is licensed as a Tennessee Nurse Practitioner as well as licensed as a Tennessee and Mississippi Registered Nurse. Ms. Johnston is a member of the American Nurses Association, the Greater Memphis Area Association for Nurse Practitioners, and the Beta Theta Chapter at large of Sigma Theta Tau. She has co-authored as abstract on the demographic and clinical characteristics of anaphylaxis. Ms. Johnston specialized in adult and pediatric allergy, asthma and clinical immunology.