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Our Providers

Katheryn Sarantos, MD

Katheryn Sarantos, MD

Dr. Katheryn Sarantos has always had a strong passion for helping others. Coupled with her affinity for medicine, she has been serving the Gainesville community for almost 20 years. She began her career as a medical student at the University of Florida, where she also completed her residency, focusing on Pediatrics. Dr. Kathy, as her patients call her, really focuses on teaching both parents and patients the importance of nutrition and exercise. She strives to instill in her patients the importance of living a healthy lifestyle, both spiritual and physical.

“We get involved in their families, their parents, and their lifestyle. As we minister to the kids about healthy eating habits, we know that we’re ministering to their parents also. So that becomes our focus, the family as a whole.”


Olga Mas, MD

Olga Mas, MD

While she has lived in the Gainesville community for almost two decades, Dr. Olga Mas brings to the practice a diverse cultural background. She provides a warm familiarity and common understanding to the diverse families she cares for.  Dr. Mas strives to provide the best care for her patients, and does all she can to help them. She completed her medical degree at Universidad Central del Este in the Dominican Republic and her residency at Arnold Palmer Hospital for Women and Children in Orlando, concentrating in Pediatrics. 

“Our partnership is solidified by our common faith in God and our commitment to provide good care for our patients.”


Michelle Massias, MD

Michelle Massias, MD

Dr. Michelle Massias became a Gator while working towards her undergraduate degree. She then ventured to NYC in 2003, where she obtained her medical degree from Ross University. She returned to Gator country to do her Pediatric Residency. She has a passion for fighting the epidemic of obesity in children and adolescence and consistently infuses the importance of daily decisions in creating a healthy lifestyle. While there are no overnight success stories, she has committed herself to continuing to encourage her patients to become the person they were created to be. Dr. Massias also has a great passion for international medical missions and this is evident by her various trips to remote parts of the world. When asked what part of pediatrics she loves the most, she said:

“I love the age spectrum; from the newborn period helping moms with breastfeeding and other common newborn issues, to the fun yet trying toddler years, to our adolescents where I feel we as pediatricians can have such a positive impact during one of the most challenging times of their lives. It’s a journey and I feel blessed to be a part of it.”


Stephanie Kirkconnell, MD

Stephanie Kirkconnell, MD

Dr. Stephanie Kirkconnell is the newest member of our Alliance Team! Dr. Stephanie grew up in Gainesville and has stayed true to her roots, completing her undergraduate and medical training at the University of Florida. As a pediatric resident, Dr. Stephanie earned the respect of her peers and supervisors, and she was selected to serve as a Pediatric Chief Resident. This distinguished position shows leadership and innovation – virtues that Alliance Pediatrics embodies. Dr.Stephanie has a heart for ensuring that all families are given equal opportunity for high quality, comprehensive and compassionate healthcare. She is accepting new patients and looks forward to creating lasting relationships with the both her patients and families.

“I am excited to be joining the Alliance Pediatrics team. Being your child’s doctor is an honor, and I look forward to serving my patients and community.”


Ginny Shreve, ARNP

Ginny Shreve, ARNP

Virginia Shreve, better known as Ginny, has been part of the Alliance team since 2000. She completed her ARNP education at the University of Florida, specializing in Pediatrics. She has a strong background in ADHD and behavioral issues, while also maintaining an interest in Autism spectrum disorders. She brings to the practice a strong work ethic along with a passion for creating lasting relationships with the families the she cares for.

“I feel very fortunate and blessed to have a job that I really love and enjoy. It is so much fun to see children grow and develop through the years. I like to be able to help parents or caregivers make the best decisions for their children by educating them and listening to their concerns.”


Beth Severance, ARNP

Beth Severance, ARNP

Beth Severance has excelled in Pediatric care since she began studying as a nurse at Emory University. She received her M.S. from Georgia State University and completed her ARNP certification at the University of Florida, with a focus on Pediatrics.  She is currently certified by the Pediatric Nursing Certification Board which mandates that the most current knowledge be maintained in her field.  After graduation, Beth worked as a pediatric nurse in the NICU, the PICU, and on various pediatric floors in the hospital setting for 12 years.  Building upon that knowledge and experience, she became a Pediatric Nurse Practitioner in 1999 and has worked hard to provide quality patient care to those in North Central Florida since that time.  She is often sought after by patients because of her knowledge of ADHD and other behavioral issues.

“Being a parent is a beautiful thing.  It involves caring for and nurturing a person from the completely dependent stage of the newborn all the way through the increasingly independent stage of adolescence and young adulthood. Every age and stage presents its own challenges and joys.  Our job is to help, during illnesses and health maintenance, all along the way.”