Our Team

Michael Helmrath, MD, MS
Director of Surgical Research
Cincinnati Children’s Hospital Medical Center

Stavra Xanthakos, MD, MS
Director, Steatohepatitis Center
Medical Director, Surgical Weight Loss Program for Teens
Cincinnati Children’s Hospital Medical Center

Heidi Kalkwarf, PhD
Scientific Director, Bionutrition & Body Composition Core Laboratory, CCTST
Associate Director, Digestive Health Center
Cincinnati Children’s Hospital Medical Center

Todd Jenkins, PhD
Co-director, Data Coordinating Center
Cincinnati Children’s Hospital Medical Center

Changchun Xie, PhD
Co-director, Data Coordinating Center
University of Cincinnati

Stephanie Sisley, MD
Medical Director of the Center for Genetic Disorders of Obesity and Medical Director of the Adolescent Bariatric Surgery Program, Texas Children's Hospital
Assistant Professor, Department of Pediatrics, Baylor College of Medicine

Mike Chen, MD
Director, Division of Pediatric Surgery
Children's of Alabama

Marc Michalsky, MD
Surgical director, Center for Healthy Weight and Nutrition
Nationwide Children’s Hospital

Anita Courcoulas, MD
Chief, Section of Minimally Invasive Bariatric and General Surgery
University of Pittsburgh Physicians

Mary Brandt, MD
Pediatric Surgeon,
Children’s Hospital New Orleans

Mac Harmon, MD, PhD
Chief, Division of Pediatric Surgery
Women and Children's Hospital of Buffalo

John Gunstad, PhD
Director of the Applied Psychology Center
Kent State University

James Mitchell, MD
Research Scientist
Sanford Research

John Dixon, MBBS, PhD
Monash University
Swinburne University

Jenn Black, MSSA is the Central Study Coordinator for the Teen-LABS Study based at Ann & Robert H. Lurie Children’s Hospital of Chicago. She works with Drs. Inge, Jenkins and Xie on all aspects of the Teen-LABS Study and oversees the sites conducting the study. She also works with the Teen-LABS Publications and Presentations Committee, the Ancillary Studies Subcommittee, and the Adjudication Committee.

Jennifer Knox, BA is the Deputy Central Study Coordinator for the Teen-LASB Study and a research coordinator at Cincinnati Children's Hospital Medical Center who works with Dr. Michael Helmrath and the bariatric surgery team. She is also responsible for cohort maintenance and retention of Teen-LABS participants at the University of Alabama at Birmingham and works with Dr. Mike Chen.

Lynda Krol, CMA and Giovanna Febbraro, MSEd are the site coordinators for Teen-LABS at the University of Pittsburgh Medical Center. They work with Anita Courcoulas, MD, Chief of Minimally Invasive Bariatric and General Surgery.

Citrine Elatrash, MBBCh, CCRP is the site coordinator for the Teen-LABS study at Baylor College of Medicine in Houston, TX. She works with Dr. Stephanie Sisley to facilitate research and collect necessary data to advance knowledge and improve quality of care.

Rebecca Harvey, RN, BSN, is the site coordinator for the Teen-LABS study at Nationwide Children’s Hospital in Columbus, Ohio, and works with Marc Michalsky, MD.