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Meet our team at Jacksonville Kids Pediatrics! Please take a few moments to learn about our skilled practitioner and our friendly, nurturing staff.

At Jacksonville Kids Pediatrics, we consider it both a great joy and responsibility to care for children. Most of us are parents ourselves, so we strive to be understanding and available to the families we are privileged to serve. We are honored that you have chosen us as your child's primary medical provider and are confident that you will be pleased with the quality of care and service that we can provide you and your family.

A vital part of our service to children begins with our outstanding staff who works hard to manage and maintain a professional, caring and supportive environment for our patients in a timely manner. Our doctor is a lifelong learner. Not only has she received advanced medical training in pediatrics, she continually pursues ongoing education to stay abreast of the latest in child health care.

Your child's health is as important to us as it is to you. We look forward to providing you with excellent medical care your child deserves.

Dr. Kostur and her family

Dr. Alexandra Kostur

Pediatrician in Jacksonville, FL

Jacksonville Kids Pediatrics

Dr. Kostur is a board-certified pediatrician with over a decade of pediatric experience in general office pediatrics and emergency pediatrics.  Dr. Kostur is a fellow of the American Academy of Pediatrics and completed her pediatric residency in 2003 at one of the nation's top-ranked children's hospitals,Cincinnati Childrens Hospital Medical Center.  

She has several years of experience working as a pediatrician in one of the busiest children's emergency rooms in the country and at a well-respected private pediatric practice.  Dr. Kostur earned her M.D. from Loyola University of Chicago in 2000 and completed undergraduate studies at Northwestern University in Evanston, IL.  Dr. Kostur is affiliated with and an active staff member at Baptist Hospital, Wolfson's Children's Hospital, and Baptist South Medical Center. 

In 2008, after relocating from Cincinnati, Dr. Kostur started her own practice - Jacksonville Kids Pediatrics.   Dr. Kostur resides in Jacksonville with her husband, Dr. Michael Petr, and their two children, Michael, age 15, and Eva, age 12.

Dr. Kostur emphasizes the importance of keeping her patients safe and healthy.  She is a strong advocate for public education on pediatric healthcare topics and the prevention of childhood injuries.  Dr. Alex has been a featured television guest on several Jacksonville local TV news stations.  Her appearances include Blue Cross Blue Shield's  Gloria Steinberg, host of "Medical Update" discussing the important topic of pediatric obesity.   Dr. Kostur's recent media appearances also include several interviews discussing choking hazards, hot dog safety, as well as Halloween Safety and infant CPR on the Channel 4 and Channel 47 morning shows. Dr. Kostur's recently published an editorial on newborn care posted on the premiere edition of Jacksonville's Expectant Mother's Guide.

Lori Barnhart, A.R.N.P.

Lori Olivarez, A.P.R.N

Lori Olivarez, A.P.R.N. is a board-certified pediatric nurse practitioner who joined Jacksonville Kids Pediatrics in May 2017. Lori has over a decade of experience in the field of pediatric primary care, both in private practice, and public service. Lori is a native of Jacksonville, Florida. She received her undergraduate degree from University of North Florida, and her Master’s Degree from University of Florida, all while working as a pediatric emergency room nurse at UF Health and Wolfson’s/Baptist Medical Center. She highly values keeping her patients healthy, and delights in creating relationships with the families that she cares for. She is adored by her patients for her kind bedside manner and excellent quality of care. She has enjoyed caring for her private pediatric patients and also for homeless children, children in Jacksonville’s foster care system, and providing care for children in third world countries through church-sponsored medical missions. In her spare time, Lori enjoys the outdoors, going to the beach, spending time with friends and family, and trying different cultural foods.