School of Medicine


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  • Jennifer Tsai

    Jennifer Tsai

    Adjunct Clinical Instructor, Pediatrics - Hematology & Oncology

    BioJennifer is a researcher in clinical development of novel therapeutics for hematologic diseases. She has a special interest in bone marrow failure and rare pediatric disorders.

  • Gabriel Tse

    Gabriel Tse

    Clinical Assistant Professor, Pediatrics

    BioDr. Gabriel Tse, MBChB, MS, is a Clinical Assistant Professor of Pediatrics and a pediatric hospitalist at Lucile Packard Children's Hospital. His clinical responsibilities include caring for hospitalized children at Stanford Medicine Children's Health. He is a grant-funded researcher whose academic interests include evaluating novel health technologies to ensure that they are safely, effectively, and equitably deployed.

  • Nichole Tyson MD

    Nichole Tyson MD

    Clinical Professor, Obstetrics & Gynecology
    Clinical Professor (By courtesy), Pediatrics

    BioNichole Tyson MD is a Clinical Professor of Obstetrics and Gynecology at Stanford University School of Medicine. She specializes in Pediatric and Adolescent Gynecology (PAG). For over 20 years, Dr. Tyson has partnered with girls and their families as they journey from childhood through adolescence and into adulthood. Dr. Tyson enjoys solving complex problems as well as common concerns that can be overlooked and challenging to girls and young women. She is been recognized locally, nationally and internationally a leader in the field and skilled and experienced surgeon caring for patients with endometriosis, adnexal masses and variations in urogenital anatomy.
    As a Pediatric and Adolescent Gynecologist, she specializes in problems such as abnormal periods, hormone management and adolescent contraception in people with underlying medical conditions, pelvic masses, differences of sex development and complex utero-vaginal anatomy.
    She has been a leader on a number of national medical committees, including Vice President of the North American Society of Pediatric and Adolescent Gynecology (NASPAG), immediate past-chair of the American Association of Gynecologic Laparoscopy (AAGL) Pediatric and Adolescent Gynecology special interest group and associate member of the Contraception Committee for the International Federation of Gynecology and Obstetrics (FIGO). She is an active contributor to the peer reviewed literature in pediatric and adolescent gynecology, obstetrics and gynecology, contraception and laparoscopic surgery. Dr. Tyson also has extensive experience with the consumer press as an adolescent gynecology expert for numerous online articles in such magazines as Seventeen, Self and NY Times.
    She is the Chief of Pediatric and Adolescent Gynecology at Stanford Children's Hospital and the Director of Mentorship and Coaching for the Ob/Gyn Department. She is passionate about teaching, mentorship and coaching, working closely with medical students, residents and fellows. She is an innovator in education, both developing and and implementing numerous curricula in Gynecology, Pediatric Adolescent Gynecology, Simulation education, Surgical Coaching and Leadership and Professionalism. She is currently working as a chief editor for two PAG textbooks-one titled PAG essentials and the other, the first ever PAG surgical textbook, both due for publication in 2024-2025.

  • Ndidi Unaka

    Ndidi Unaka

    Clinical Professor, Pediatrics

    BioDr. Unaka is the inaugural Chief Health Equity Officer (CHEO) for Stanford Medicine Children’s Health (SMCH) and a Clinical Professor in the Department of Pediatrics at Stanford University School of Medicine. Prior to her transition to SMCH in July 2024, Dr. Unaka was a faculty member in the Division of Hospital Medicine at Cincinnati Children's Hospital. In addition to her clinical role as a pediatric hospitalist, Dr. Unaka served as the Associate Program Director of the Pediatric Residency Program from 2011 – January 2022. She served as the medical director of a 48- bed inpatient unit primarily for patients admitted to the Hospital Medicine service. In this role, Dr. Unaka was involved in several equity-oriented quality improvement initiatives which included work to identify, and address hunger among caregivers of hospitalized children insured by Medicaid.

    Dr. Unaka worked on institution-level community health initiatives at Cincinnati Children’s. She served as the Medical Director of Quality Improvement and Data Analytics for Cincinnati Children’s Medicaid- focused, accountable care organization (HealthVine). In this role, she developed and led initiatives designed to improve the quality and efficiency of health care delivery to HealthVine’s patient population and helped lead the change management associated with the movement toward a population-health care model that improves quality, narrows equity gaps, streamlines care, and reduces costs. She helped define appropriate health care delivery, equity, and population health measures and quality benchmarks. Additionally, Dr. Unaka was a faculty lead within Cincinnati Children's Fisher Child Health Equity Center, and she specifically focused on working with operations leaders to ensure equity was embedded within all strategic plans, goals, and metrics across all sites of care. Dr. Unaka partnered with several colleagues to lead system-wide quality improvement initiatives including work accelerated via learning networks. She was the co-lead of Cincinnati Children's Health Equity Network (HEN), an initiative borne out of the pursuit of excellent and equitable health outcomes for youth in Greater Cincinnati. The HEN supports clinical teams seeking to eliminate disparities in child health outcomes by race, ethnicity, and/or socioeconomic status via targeted interventions and best practices by addressing both medical and social factors known to confer poor health outcomes.

  • Tulio Valdez, MD, MSc

    Tulio Valdez, MD, MSc

    Professor of Otolaryngology - Head & Neck Surgery (OHNS) and, by courtesy, of Pediatrics

    BioDr. Tulio A Valdez is a surgeon scientist born and raised in Colombia with a subspecialty interest in Pediatric Otolaryngology. He attended medical school at Universidad Javeriana in Bogota Colombia before undertaking his residency in Otolaryngology, Head and Neck Surgery in Boston. He completed his Pediatric Otolaryngology Fellowship at Texas Children’s Hospital (2007), Houston and obtained his Master’s in Clinical and Translational Research at the University of Connecticut.

    Clinically, Dr. Valdez has an interest in pediatric sleep apnea. He has a special interest in the management of sinus disease in cystic fibrosis. Dr. Valdez has co-authored one textbook and numerous book chapters and scientific manuscripts. Dr. Valdez continues his clinical research in these areas, particularly with a focus on aerodigestive disorders.

    Scientifically, Dr. Valdez has developed various imaging methods to diagnose otitis media and cholesteatoma a middle ear condition that can lead to hearing loss. He was part of the Laser Biomedical Research Center at the Massachusetts Institute of Technology. His research includes novel imaging modalities to better diagnose ear infections one of the most common pediatric problems. His research has now expanded to include better intraoperative imaging modalities in pediatric patients to improve surgical outcomes without the need for radiation exposure. 

    Dr. Valdez believes in multi-disciplinary collaborations to tackle medical problems and has co-invented various medical devices and surgical simulation models.

  • Keith Van Haren, MD

    Keith Van Haren, MD

    Associate Professor of Neurology and Neurological Sciences (Pediatric Neurology) and of Pediatrics

    Current Research and Scholarly InterestsOur research team is working to develop new treatments for children at risk of neurodegenerative diseases. We are primarily focused on multiple sclerosis and X-linked adrenoleukodystrophy, two conditions that involve inflammatory and metabolic disruption of the myelin that insulates brain cells. A key area of interest for us is how nutrient deficiencies during childhood may contribute to the disease processes and whether nutritional interventions could play a role in prevention.