Clinical Focus

  • Internal Medicine
  • Public Health
  • Community Health

Academic Appointments

Administrative Appointments

  • Co-Director of Community Health Scholarly Concentration, Stanford University School of Medicine (2022 - Present)
  • Medical Director of Community Partnerships, Division of Primary Care and Population Health (2022 - Present)
  • Medical Education Faculty Lead: Community Engagement and Advocacy, Division of Primary Care and Population Health (2020 - Present)
  • Directory of Community Health, Center for Asian Health, Research, and Education (2019 - Present)
  • Assistant Health Officer, San Mateo County Health System (2017 - Present)
  • Assistant Professor, Eastern Virginia Medical School (2012 - 2018)
  • Health Director and Health Officer, Virginia Department of Health (2011 - 2017)

Honors & Awards

  • Walt Newman Award for Exceptional Community Service, Stanford University School of Medicine (2024)
  • Henry J. Kaiser Family Foundation Award for Preclinical Teaching, Stanford University School of Medicine (2024)
  • Division Teaching Award, Stanford Department of Medicine (2023)
  • Outstanding Community Engaged Faculty Award, Stanford Office of Community Engagement (2022)
  • Award for Exceptional Contributions to Service-Learning, Stanford School of Medicine (2021)
  • Faculty Fellow, Haas Center for Public Service (2019)

Boards, Advisory Committees, Professional Organizations

  • Advisory Committee Member, The Kresge Foundation (2016 - Present)
  • Co-Chair, United for Children Program on Health, United Way of South Hampton Roads (2016 - 2017)
  • Site Visitor, Public Health Accreditation Board (2014 - 2016)
  • Advisory Board Member, Brock Institute for Community and Global Health, Eastern Virginia Medical School (2013 - 2017)
  • Executive Board Member, Healthy Portsmouth (2013 - 2017)
  • Member, National Association of County and City Health Officials (2011 - Present)

Professional Education

  • BS, Duke University, English, Biology (1999)
  • MD, Tufts University School of Medicine (2008)
  • DrPH, University of North Carolina Gllings School of Global Public Health, Health Policy and Management (2019)
  • Board Certification: American Board of Internal Medicine, Internal Medicine (2011)
  • Residency: Johns Hopkins Bayview Hospital Internal Medicine Residency (2011) MD

Community and International Work

  • Stanford Housing Equity Project

    Topic

    Homelessness, Substance Use Disorders

    Partnering Organization(s)

    LifeMoves

    Populations Served

    San Mateo and Santa Clara Counties

    Location

    Bay Area

    Ongoing Project

    Yes

    Opportunities for Student Involvement

    Yes

  • Peninsula Healthcare Connection, Palo Alto, California

    Partnering Organization(s)

    The Opportunity Center

    Populations Served

    Homeless

    Location

    International

    Ongoing Project

    Yes

    Opportunities for Student Involvement

    Yes

  • Nature and Health, San Mateo County Health System

    Populations Served

    San Mateo County Health System Patients

    Location

    Bay Area

    Ongoing Project

    Yes

    Opportunities for Student Involvement

    Yes

  • Stanford Medical School Christian Fellowship, Faculty Advisor

    Location

    Bay Area

    Ongoing Project

    Yes

    Opportunities for Student Involvement

    Yes

Contact

  • Academic
    changds@stanford.edu
    University - Academic staff Department: Med/Primary Care and Population Health Position: Clinical Associate Professor
    • 211 QUARRY RD
    • MC 5987
    • PALO ALTO,  California  94304 
    (650) 725-7078 (fax)
  • Clinical (Primary)  Stanford Internal Medicine 211 Quarry Rd Ste 305 MC 5987 Palo Alto, CA 94304 (650) 725-7078 (fax)

Additional Clinical Info

Additional Info

  • Mail Code: 5411

2024-25 Courses

Stanford Advisees

All Publications

  • Perceptions of providers and unhoused patients on access to eye care in Santa Clara County: A qualitative study. Optometry and vision science : official publication of the American Academy of Optometry Liu, J. M., Chang, M., Liu, F. M., Patel, B., Chang, D. S. 2025

    Abstract

    Perspectives on eye care barriers differ between low-income patients and vision care providers. Comparing these views provides valuable insight into strategies for addressing disparities in underserved communities, especially in regions with significant income inequality and opportunity gaps.The aim is to identify obstacles that prevent individuals who are unhoused, have low income, or are publicly insured in Santa Clara County from accessing basic refractive eye exams and corrective glasses.Patients aged ≥18 years with low income presenting to a free vision care clinic in Northern California (n = 15) and vision care providers who primarily work with underserved patients in Santa Clara County, California (n = 11) participated in one-on-one phone interviews. Interviews were transcribed and analyzed.Most participants (87% patients and 82% providers) say that basic vision care (refractive eye exam and eyeglasses) in Santa Clara County is unaffordable and that in-person eye exams can be physically inaccessible (67% patients and 91% providers) due to busy work schedules or limited access to transportation. However, patient and provider perspectives on intrinsic barriers to accessing eye care diverge. In total, 73% of providers stated that limited health literacy contributed to lower utilization of routine vision care, while 47% of patients cited limited empathy from providers as responsible for their negative experiences and dissatisfaction with care.In Santa Clara County, patients with low income and their providers both identify similar external barriers to basic vision care: high costs, inadequate insurance coverage, and limited services. However, patients and providers may disagree on intrinsic barriers to accessing care. Suggestions for improving access to vision care include more help from healthcare coordinators, better information about affordable services, improved vision insurance, and mobile healthcare options.

    View details for DOI 10.1097/OPX.0000000000002250

    View details for PubMedID 40261685