School of Medicine


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  • 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.

  • Crystal Unzueta, MD

    Crystal Unzueta, MD

    Clinical Assistant Professor, Medicine - Primary Care and Population Health

    BioDr. Unzueta is a board-certified family medicine physician. She specializes in providing primary care services to people of all ages. Her services include annual check-ups, monitoring chronic conditions, and performing minor in-office procedures.

    She is also a clinical assistant professor in the Stanford School of Medicine Department of Family Medicine.

    Dr. Unzueta’s practice focuses on providing compassionate and comprehensive care. She specializes in providing bilingual and bicultural care for patients in underserved populations. She has traveled to Belize on a medical mission to provide free, basic primary care to vulnerable communities. Her mentoring work includes building a network of Latino medical students to help support each other throughout medical school. She has also worked on numerous volunteer projects, such as researching the benefits of a community yoga program for minorities in underserved areas.

  • Alexander Eckehart Urban

    Alexander Eckehart Urban

    Associate Professor of Psychiatry and Behavioral Sciences (Major Laboratories and Clinical Translational Neurosciences Incubator) and of Genetics

    Current Research and Scholarly InterestsComplex behavioral and neuropsychiatric phenotypes often have a strong genetic component. This genetic component is often extremely complex and difficult to dissect. The current revolution in genome technology means that we can avail ourselves to tools that make it possible for the first time to begin understanding the complex genetic and epigenetic interactions at the basis of the human mind.

  • PJ Utz

    PJ Utz

    Professor of Medicine (Immunology and Rheumatology)

    Current Research and Scholarly InterestsThe long-term research goal of the Utz laboratory is to understand autoimmunity, autoantibodies, and how tolerance is broken and can be reestablished.

  • Sivakamasundari V

    Sivakamasundari V

    Instructor, Institute for Stem Cell Biology and Regenerative Medicine

    BioMy research interests are focused on understanding the molecular basis of early development and stem cells, as it is often aberrations in stem cells or signaling mechanisms between tissues that lead to diseased states, including tumor development and cancer progression. Knowledge of stem cells and development is also critical to develop appropriate cell-based therapies for various diseases or injuries. My prior and current works take advantage of both traditional techniques (gene targeting, lineage tracing) and state-of-the-art technologies (Single cell RNA sequencing, Chromatin Immunoprecipitation (ChIP-seq), Imaging Mass Cytometry) to elucidate fundamental molecular mechanisms underlying signaling in tissue biology.

  • Randall Vagelos, MD

    Randall Vagelos, MD

    Professor of Medicine (Cardiovascular)

    Current Research and Scholarly InterestsI. Congestive Heart Failure New Medical Therapies Prognostic Evaluation Selection for Cardiac Transplantation II. Screening for Myocardial Necrosis New ECG Monitoring Devices New Serum Markers III. Screening for CAD Patients Who Have Received Radiation Rx Diabetics Being Considered for Renal Transplantation
    IV. Advanced coronary and valvular disease, evaluationg candidacy for high risk interventions.

  • Sharif Vakili, MD, MBA, MS

    Sharif Vakili, MD, MBA, MS

    Clinical Assistant Professor, Medicine - Primary Care and Population Health

    BioSharif Vakili, MD, MBA, MS, (pronouns: he/him), is an internal medicine physician and educator. He practices at Stanford Los Altos Primary Care.

    Dr. Vakili has a background in chronic disease management and health systems delivery, believing strongly in a teamwork approach to patient care that empowers patients to navigate the health system as part of their clinical care.

    He is active in the research and business communities. His research has been in peer-reviewed journals including JAMA Network Open, the Annals of Emergency Medicine, Quality Management in Healthcare, and Journal of Clinical Rheumatology.

    Dr. Vakili is also the inventor of Remote Patient Intervention (RPI), a model of clinician-supervised AI care delivery first performed at Stanford during a clinical study published in JAMA Network Open.

  • Hannah Valantine

    Hannah Valantine

    Professor of Medicine (Cardiovascular)
    On Leave from 09/01/2024 To 08/31/2025

    Current Research and Scholarly InterestsMy lab is focused on understanding the mechanism mediating acute and chronic allograft failure, in particular on the role of microvascular injury in acute allograft failure and the mechanisms of mediating transplant coronary artery disease. 1. Role of microvascular injury in acute allograft failure.

  • 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.

  • Keara E. Valentine

    Keara E. Valentine

    Clinical Assistant Professor, Psychiatry and Behavioral Sciences

    BioKeara E. Valentine, Psy.D., is a clinical assistant professor at Stanford University School of Medicine in the Psychosocial Treatment Clinic and OCD Clinic, where she specializes in the assessment and treatment of OCD and related disorders. Dr. Valentine utilizes behavioral-based therapies including Cognitive Behavioral Therapy (CBT) and Exposure and Response Prevention (ERP) with children, adolescents, and adults experiencing anxiety-related disorders.

    Dr. Valentine completed an APA accredited pre-doctoral internship at Alexian Brothers Behavioral Health Hospital, where she complete a rotation in OCD and anxiety disorders and a rotation in Eating Disorders. Dr. Valentine has experience working with individuals with OCD, anxiety, and/or eating disorders at various levels of care including outpatient, partial hospitalization, residential, and inpatient.

  • Laurent D Valosek

    Laurent D Valosek

    Academic Staff - Hourly - CSL, Medicine
    Lecturer, Med/SPRC - Health and Human Performance

    BioMr. Valosek has 35 years of experience as an entrepreneur, educator and researcher. He was co-founder and CEO of Integrated Devices LLC, a wireless engineering consulting firm, Xistor Technology Development Corporation, a semiconductor intellectual property company, and Sophia Communications, a wireless technology development and wide area network service provider. He also co-founded a strategy and business development consulting firm, Lakshmi Technologies, with partners from the Boston Consulting Group and Deloitte, focused on providing services to early stage high technology companies. Mr. Valosek has extensive experience in the areas of strategy, planning, recruiting, training, business development and general management.

    In addition to his business expertise, Mr. Valosek has a long standing interest in the role of human development as it relates to health, education, organizational effectiveness and social transformation. He helped conduct NIH-funded research on meditation and heart health at the West Oakland Health Center and ADHD research with middle school students in the Albany Unified School District. He co-founded the Center for Wellness and Achievement in Education in 2007, for the purpose of providing evidence-based wellness programs to students, schools, school districts and other community organizations.