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Program Leadership

Pulmonology Fellowship


Sophia Williams, MD MPH
Program Director

Watching family members face difficult illnesses inspired Sophia N. Williams, MD, to become a doctor. She wanted the opportunity to find medical solutions and provide compassionate health care.

As a pediatric pulmonologist, Dr. Williams completed her fellowship at Miller Children’s Hospital in California. She offers children with a full range of respiratory conditions the most advanced approaches to diagnosis and treatment. She specializes in cystic fibrosis, mobile asthma care, pulmonary hypertension, and bronchopulmonary dysplasia.

“Pulmonary care, to a certain extent, is very mechanical,” says Dr. Williams. “It fosters my joy for problem-solving and exploring new things.”

“I enjoy being on the journey to good health with the child and their family,” she says. “I want them to enjoy life to their fullest potential. In delivering care, I strive to incorporate family values and conduct a very family-centered approach. Plus, children are fun and resilient, so they are a great population to work with.”

Recognized as one of Phoenix Magazine’s TopDocs for the last four years, Dr. Williams is active in local and state professional organizations. She is a Cystic Fibrosis Foundation Advisory Board member, a committee member for the Program Evaluation/Pediatric Residency Committee as well as the Continuing Medical Education (CME) Committee here at Phoenix Children’s hospital and she also serves as Pulmonary Rotation and Pulmonary Fellowship Director.

Outside of work, Dr. Williams enjoys cooking with her son, dancing, and traveling.

Rupali Drewek, MD

She attended Ross University School of Medical school and received her pulmonary and sleep training at Children's Hospital of New Orleans and Medical College of Wisconsin. Her clinical interests include asthma and obstructive sleep apnea. Her research interests include value and quality-based care in asthma.  Additionally, she is interested in how to improve outcomes in obese adolescents with obstructive sleep apnea and is actively involved with the clinical pathways committee.  In her free time, Dr. Drewek loves to read and travel.

Rajeev Bhatia, MD

Rajeev Bhatia, MD, is currently appointed as Division Chief, Pulmonary at Phoenix Children's Hospital, Phoenix, and Associate Professor, Department of Child Health, University of Arizona College of Medicine-Phoenix, Arizona.  He is also the co-director of the Human Performance lab here at Phoenix Children's Hospital. He earned his fellowship in pediatric pulmonology from Children's Hospital Los Angeles, California. Dr. Bhatia is one of the few pediatric pulmonologists across the United States with interest and expertise in pediatric exercise testing. He is currently serving as a member of the American Academy of Pediatrics (AAP) Executive Committee of the Section on Pediatric Pulmonology and Sleep Medicine (SOPPSM). Dr. Bhatia also served as a member of the AAP's Ohio Chapter's Home and School Health Committee.

James Woodward, MD

Education & Training
Board Certification Pediatric Pulmonology; General Pediatrics
Medical School / Education St. Louis University School of Medicine, St. Louis, MO
Residency (Pediatrics) Children’s Mercy Hospital, Kansas City, MO
Fellowship (Pediatric Pulmonology) Duke University Medical Center, Durham, NC

Professional Affiliations
American College of Chest Physicians


Research & Publications
Home Ventilation; Neuromuscular Respiratory Problems; Aerodigestive Disorders

Michelle Ratkiewicz, DO

As a specialist in pediatric pulmonology, Michelle "Mia" Ratkiewicz, DO, helps children and families navigate chronic breathing conditions. With a kind, compassionate and thorough approach to care, Dr. Ratkiewicz helps kids live lives full of happiness and hope. "I love helping kids to just be kids - play sports or go to the park without coughing and getting out of breath," Dr. Ratkiewicz says. While completing her residency at Phoenix Children's, Dr. Ratkiewicz fell in love with the energy and team atmosphere. Arizona's blue skies and sunshine also made it easier for the Michigan native to choose Phoenix Children's. When she's not working, Dr. Ratkiewicz likes to travel, hike, take long dog walks and practice yoga. She enjoys spending time with her family and friends, as well as cooking and reading.

Gerald Gong, MD

Education & Training
Board Certification Pediatric Pulmonology; General Pediatrics; Internal Medicine
Medical School / Education Loyola University of Chicago Stritch School of Medicine, Maywood, IL
Residency (Internal Medicine/Pediatrics) Good Samaritan Regional Medical Center, Phoenix, AZ
Fellowship (Pediatric Pulmonology) Children's Hospital of Los Angeles, Los Angeles, CA
Internship (Internal Medicine/Pediatrics) Good Samaritan Regional Medical Center, Phoenix, AZ

Professional Affiliations
American Board of Internal Medicine; American Academy of Pediatrics; American Thoracic Society; American College of Chest Physicians

Andres Herrera-Camino, MD

With expertise in respiratory and critical care medicine, Andres Herrera-Camino, MD, strives to provide high-quality, comprehensive care for patients with complex needs. His clinical and research interests focus on understanding long-term effects that critical illnesses have on the physical, mental, and cognitive domains among ICU survivors. He is particularly interested in characterizing long-term pulmonary sequelae that affect children with severe acute respiratory failure and in implementing programs to mitigate some of these morbidities. The comprehensive and collaborative approach to patient care in the ICU, as well as the in-depth knowledge and understanding of human physiology and my interest in continuity of care and patient outcomes after hospital discharge, drew me to these fields," says Dr. Herrera-Camino, who received his dual training in pediatric critical care and pulmonary medicine at Washington University in St. Louis. Dr. Herrera-Camino completed his undergraduate training in Lima, Peru, and his pediatric residency at Indiana University/Riley Hospital for Children. Dr. Herrera-Camino is a fellow of The American Academy of Pediatrics and a member of The American Thoracic Society, The Society of Critical Care Medicine and The European Respiratory Society. Dr. Herrera-Camino enjoys participating in outdoor activities such as hiking, biking, and camping.

Pulmonary Department at a Glance

Natalia Argel, RN

Natalia Argel graduated with BS In Nursing from Arizona State University in 1989.  She has worked at Phoenix Children’s Hospital in various roles since her career began.  She has worked on numerous pharmaceutical trials, retrospective studies and investigator studies in CF and other pulmonary diseases.  

Her research interests are pain, palliative care, and quality improvement in CF.

She participates in various committees including nursing research and has assisted leading the CF team with their quality improvement projects.

Her other interests include attending sporting events, taking photos of her beagles, Snoopy collectibles, and travelling.

Research Department at a Glance

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