2025 annual report

Celebrating the accomplishments and contributions of our scientists, physician researchers, and staff

As we reflect on 2025, we recognize a year marked by both challenge and resilience.

January’s Southern California wildfires deeply affected our research community, displacing many due to evacuations, smoke or other property damage, and even loss of homes. In the midst of hardship, our department came together to support one another and our communities. Many donated goods or volunteered their time. Others used their scientific expertise to study the short- and long-term effects of wildfire, from health care utilization to potential impacts on pregnant mothers and their children.

In the months that followed, our research program, like many others around the country, navigated an uncertain funding environment. Throughout this period, our leadership team, scientists, physician researchers, and staff responded with focus, adaptability, and a shared sense of purpose. Even as our funding mix evolved, we secured new grants and contracts, ending the year on solid financial footing and with significant scientific achievements.

These accomplishments reflect the dedication of our research scientists, physician researchers, and staff. We are grateful for the rigor, collaboration, and commitment each individual and team brings to our department, and for the way our community supports one another while advancing care and discovery.

We extend our sincere thanks to Kim Kaiser, EdD, for her administrative leadership from mid-2021 through 2025, who took on a new role as Chief Administrative Officer for the Downey Medical Center in January 2026. Her steady guidance strengthened our department and expanded our connections with the SCPMG Quality organization. We look forward to working closely with her successor, Julie John, MA, MSN, RN, as we advance research that improves care and health outcomes for Kaiser Permanente members and the communities we serve.

Investigators and staff

40+
Research scientists
Includes physician and scientific directors, research scientists, post-doctoral fellows and EIS officer
~450
Staff
Includes research support and clinical trials support staff, programmers, biostatisticians, and clinical informatics personnel; and administration, business office, operations, IT, and communications staff
22
Scientists on faculty
At the Kaiser Permanente Bernard J. Tyson School of Medicine
7
Divisions
Includes 6 Scientific Divisions and a Shared Services division.

High-impact research

  • Scientists and physicians published a record number of journal articles in 2025.

Scientists, physicians, and others in Kaiser Permanente Southern California published 772 journal articles in 2025.

Despite a challenging environment, our research teams published the highest number of journal articles in the history of the research program, exceeding the already high numbers recorded during the peak COVID-19 years. Publications covered diverse areas of focus, including cancer, child and adolescent health, cardiometabolic health, infectious disease, mental health, and vaccines. This work spanned the full continuum of care, informing preventive strategies, clinical treatment decisions, and long-term health needs and outcomes.

Research with real-world impact

Our research turns evidence into everyday care and healthier communities. By testing solutions in real-world settings, we remove barriers, improve workflows, and help successful approaches spread across systems.

One example is an in-office hemoglobin A1C testing program for diabetes care. With results available during the visit, clinicians can adjust treatment immediately. A study published January 13, 2025, in the Journal of General Internal Medicine found improved blood sugar levels among patients with poorly controlled diabetes, showing how a simple workflow change can improve outcomes.

We also generate evidence that shapes healthier environments. Over 25 years of parks research, investigators have shown how design and programming support physical activity and well-being. Communities use this evidence to guide investments that help more people move and connect.

In specialty care, clinical trials help patients benefit from new discoveries sooner. At Kaiser Permanente Riverside Medical Center, a retinal research center expands access to studies such as gene therapy and new stem cell delivery techniques. By integrating research into care, we accelerate progress while protecting vision and quality of life.

Many of our published studies identify practical ways to improve outcomes. Examples include reduced dementia risk among older adults who received the shingles vaccine, new insights on opioid tapering and overdose risk, and evidence that physical activity supports postpartum weight loss.

Learn more in 2025 Research Highlights.

 

Findings that make headlines

Our research program made headlines throughout 2025, with dozens of studies covered by leading national and regional media including the Associated Press, the Los Angeles Times, NPR, and NBC News. This coverage amplified how evidence generated in our care settings informs decisions that affect patients and communities.

Reporters focused on a wide range of topics, from emergency response and virtual care during the Los Angeles wildfires to studies on the protective benefits of the shingles vaccine. Media also covered practice-changing findings on intensive blood pressure control for patients with chronic kidney disease and research on suicide prevention following implementation of the Zero Suicide Model.

Our experts were in the news as well. Physicians and scientists were tapped to interpret new findings and explain what they mean for care delivery. Their voices helped translate complex research into actionable, patient-centered insight, strengthening trust in Kaiser Permanente Southern California as a source of credible health information.

Learn more in Research in the Media. 

Publications

772
Journal articles published
123
Child and adolescent health
112
Cancer
89
Health Equity
80
Bone Health and Orthopedics
79
Cardiovascular Disease
51
Immunization
51
Maternal Health
46
Neurological Disorders
42
Social Needs
36
Mental Health
25
Diabetes

New & notable clinical projects

Dedicated programs in our region support clinically relevant research to improve the health of our patients and the communities we serve.

In 2025, the clinical trials team supported more than 430 active clinical trials protocols across 39 therapeutic areas, offering our patients opportunities to participate in research that may shape the future standards of care.

Our clinical trials program connects patients with leading‑edge research, offering opportunities to access potentially life-saving treatments, spanning investigational medications and devices as well as prevention strategies.

Highlighted cancer studies include trials that add targeted therapy to lung cancer immunotherapy, use post-surgery blood tests to guide colon cancer chemotherapy, and test de-escalated regimens that preserve outcomes. Other studies aim to reduce long-term side effects of breast cancer treatment and compare new hormone options for advanced prostate cancer.

Our general medicine portfolio spans multiple therapeutic areas, including studies of new devices and therapies for heart disease, stroke, kidney disease, macular degeneration and high-risk pregnancy. Prevention trials test longer-acting HIV prevention and immune-based acne strategies.

Learn more about our 2025 Selected Clinical Trials.

Embedding research in clinical practice

The Care Improvement Research Team advances research that is embedded in day-to-day clinical practice. Scientists collaborate with frontline clinicians and operational leaders to identify research questions that matter most to patients and health professionals.

Each year, the program funds a small set of projects that are clinically and operationally relevant, with guidance and financial support from the Southern California Permanente Medical Group. Results from CIRT projects help improve care delivery and health outcomes for Kaiser Permanente members.

In 2025, CIRT funded 14 projects.

Learn more about the 2025 CIRT projects.

Engaging physicians in research

The Regional Research Committee serves as a key hub for engaging physicians in research across the region. It supports multiple programs to connect frontline clinicians and operational leaders with clinically relevant research.

Each year, the committee awards funds from Kaiser Permanente’s Community Health program for research projects led by clinicians and other health care professionals in Southern California. These studies tackle practical clinical questions and can help identify more effective ways to prevent and treat common health conditions.

In 2025, the committee awarded funds to support 16 studies in 3 categories:  Traditional grants, RRC Ambient AI grants, and RRC-KPSOM Research Program Development grants.

Learn more about the 2025 RRC projects.

Clinical Research Projects

600+
Physician investigators
Leading clinical trials and other clinical research studies
430
Active clinical trials
Across the region
39
Therapeutic areas
Offer clinical trials
16
Regional Research Committee Projects
Traditional, AI-focused, and development projects
24
Regional Research Committee members
Includes chairs and vice chairs across the region
14
Care Improvement Research Team Projects
New and continuing

Financial overview

Funding for research at Kaiser Permanente Southern California totaled $94.2 million in 2025.

Despite a challenging environment, our research program continued to attract new funds and ended the year on solid financial footing.

Kaiser Permanente Southern California research funding comes from a variety of external and internal sources.

In 2025, 70% of total funding came from external sources. Of that, 50% came from federal grants and 50% from industry and foundation contracts.

Kaiser Permanente provided the remaining funds, through the Kaiser Permanente Community Health program, the Southern California Permanente Medical Group, and the Garfield Memorial Fund.

There were more than 460 funded research projects in 2025 in Kaiser Permanente Southern California, including new and ongoing studies.

Research funding

$94 million
Total research funding
$66 million
External funding
$28 million
Internal funding
185
New grants and contracts submitted
111
New grants and contracts awarded
464
Funded research projects

Leadership and investigators

Our research program encompasses investigators in 6 scientific divisions. Each division is led by a scientific or physician director. Administrative leadership oversees research support, technical, operational, business, and other teams that support research efforts.

 

Scientific leadership

Benjamin I. Broder, MD, PhD, interim senior director of research

Huong Q. Nguyen, PhD, RN, interim scientific director, Health Services Research & Implementation Science

Kristi Reynolds, PhD, MPH, scientific director, Epidemiologic Research

William J. Towner, MD, FACP, FIDSA, physician director, Clinical Trials

Bechien U. Wu, MD, MPH, physician director, Clinician Research

Anny H. Xiang, PhD, MS, scientific director, Biostatistics Research

Deborah Rohm Young, PhD, MBA, scientific director, Behavioral Research

Administrative leadership

Kim E. Kaiser, EdD, MHA, administrative leader

Annie Chen, MBA, director of research administration, Shared Services

Hai Linh Kerrigan, PharmD, division research administrator, Clinical Trials Research

Allan Slatkin, division research administrator, Behavioral Research, Biostatistics Research, Clinician Research, Epidemiologic Research, and Health Services Research & Implementation Science

Investigators

Division of Behavioral Health

Scientific director

Deborah Rohm Young, PhD, MBA

2025 research scientists

Deborah A. Cohen, MD, MPH
Corinna Koebnick, PhD, MSc
Claudia Nau, PhD
Sonya Negriff, PhD
Laurel Sarfan, PhD

View current investigators

Division of Biostatistics Research

Scientific director

Anny H. Xiang, PhD, MS

2025 research scientists

Heidi Fischer, PhD
Bing Han, PhD
Lei Qian, PhD
Ernest Shen, PhD
Margo A. Sidell, ScD, MSPH
Jeff Slezak, MS
Stanley Xu, PhD, MS
Hui Zhou, PhD, MS

View current investigators

Division of Clinical Trials Research

Physician director

William J. Towner, MD, FACP, FIDSA, Infectious Diseases, Los Angeles

2025 principal investigators by therapeutic area

Bone Marrow Transplant

Leonardo Torres Farol, MD, Los Angeles

Cardiology

Somjot S. Brar, MD, MPH, Los Angeles
Jeffrey Cavendish, MD, San Diego
Nigel Gupta, MD, Los Angeles
Bahram Khadivi, MD, San Diego
William J. Mosley II, MD, FACC, San Bernardino County
Jonathan Neyer, MD, Los Angeles

Colorectal Surgery

Daniel Klaristenfeld, MD, San Diego

Endocrinology

Patricia Wu, MD, San Diego

Gastroenterology

Gareth S. Dulai, MD, Downey
Bechien U. Wu, MD, MPH, Los Angeles

Genetics and Genomics

Divya Vats, MD, Los Angeles

Gynecologic Oncology

Scott E. Lentz, MD, FACS, Los Angeles
Devansu Tewari, MD, MBA, Orange County

Hematology Oncology

Ashraf, R., Aziz, MD, Orange County
Gary L. Buchshacher Jr., MD, PhD, Los Angeles
Sujatha Murali, MD, San Marcos
Eric McGary, MD, PhD, MPH, Los Angeles
Helen Moon, MD, Riverside

Hepatology

Amandeep Sahota, MD, Los Angeles

Infectious Diseases

William J. Towner, MD, FACP, FIDSA, Los Angeles
Jonathan Truong, MD, Antelope Valley

Nephrology

Stephanie Cheung, MD, Orange County
John J. Sim, MD, Los Angeles
Hui Xue, MD, MSc, San Diego

Neurology

Annette Langer-Gould, MD, Los Angeles
Abel Wu, MD, Los Angeles

Neurology-Oncology

Richard Green, MD, Los Angeles

Neurology-Vascular (Stroke)

Zahra A. Ajani, MD, Los Angeles
Pamela Cheng, DO, Los Angeles
William Neil, MD, San Diego
Navdeep Sangha, MD, Los Angeles
Shayandokht Taleb, MD, Los Angeles

Neurosurgery

Harsimran S. Brara, MD, FAANS, Los Angeles
Vaninder Chhabra, MD, San Bernardino County

Ophthalmology

Michelle Britt, MD, Baldwin Park
Vivienne S. Hau, MD, PhD, Riverside
Damien Rodger, MD, PhD, Los Angeles
Neil M. Vyas, MD, Panorama City
Kapil M. Sampat, DO, Riverside
Neepa Shah, MD, Riverside

Orthopedics

Jeffrey I. Kessler, MD, Los Angeles

Pediatric Oncology

Robert M. Cooper, MD, Los Angeles

Pediatric Pulmonology

Muhammad Saeed, MD, Los Angeles

Pulmonary

Kenneth Wei, MD, Los Angeles

Radiology – Interventional

Michael Girard, MD, San Diego

Radiation Oncology

Aakash Batra, MD, Bellflower

Radiology – Neuroradiology

Lei Feng, MD, PhD, Los Angeles
Conrad Liang, MD, PhD, San Bernardino County

Rheumatology

Steve S. Lee, DO, San Bernardino County
Andrew Nguyen, MD, Orange County

Sleep Medicine

Prasanth Manthena, MD, Los Angeles

Surgical Oncology

Vikram Attaluri, MD, FACS, FASCRS, Los Angeles
Elisabeth McLemore, MD, FACS, Los Angeles

Urogynecology

Kimberly Ferrante, MD, MAS, San Diego
Shawn A. Menefee, MD, San Diego
John N. Nguyen, MD, Downey
Emily L. Whitcomb, MD, MAS, Orange County

Vascular Surgery

Catherine Chang, MD, San Diego
Linda Chun, MD, Los Angeles
Edward Plecha, MD, San Diego

View current division

Division of Clinician Research

Physician director and chair of Regional Research Committee

Bechien U. Wu, MD, MPH, Gastroenterology, Los Angeles

2025 Regional Research Committee

Antelope Valley

Jonathan Truong, MD, area research chair
David Bronstein, MD, vice area research chair

Baldwin Park

Gaurav Khanna, MD, area research chair
Bobeck S. Modjtahedi, MD, vice area research chair

Downey

Eugene A. Chu, MD, area research chair
Rajeev Attam, MD, vice area research chair

Los Angeles

Mingsum Lee, MD, area research chair
Javed Sheikh, MD, vice area research chair

Orange County

Emily L. Whitcomb, MD, MAS, area research chair
Ali Ghobadi, MD, vice area research chair

Panorama City

Ahmed Dehal, MD, area research chair

Regional Laboratory

Darryl Palmer-Toy, MD, PhD, area research chair

Riverside

Rachid A. Elkoustaf, MD, area research chair
Vivienne S. Hau, MD, vice area research chair

San Bernardino County

Conrad Liang, MD, PhD, area research chair
Steve S. Lee, DO, vice area research chair

San Diego

Shawn A. Menefee, MD, area research chair

South Bay

David S. Cohen, MD, area research chair

West Los Angeles/Kern County

Michael J. Fassett, MD, area research chair
Daniel T. Lang, MD, vice area research chair

Woodland Hills/Ventura County

Armen Aboulian, MD, area research chair
Monique George, MD, vice area research chair

Department of Research & Evaluation

Deborah Rohm Young, PhD, MBA, area research chair

Clinician Investigator Program

2025 appointees

Christopher Filson, MD, MS (2025-2028)
Cheng-Wei Huang, MD (2023–2025)
Dennis Hwang, MD (2019–2021, 2023–2025)
Richard Treger, MD (2024-2026)
Yvonne Tsai, MD (2025-2028)

Previous appointees

Raymond Chen, MD, DPhil (2016–2018)

Fu-Sheng Chou, MD, PhD (2022–2024)
Ahmed Dehal, MD, MPH, FACS, FSSO, FRCS (2022–2024)
Kimberly Ferrante, MD, MAS (2019–2021)
Mingsum Lee, MD, MPH (2021–2023)
Bobeck S. Modjtahedi, MD (2018–2020, 2020–2022)
Casey K. Ng, MD (2017–2019)
Chileshe Nkonde-Price, MD, MS, FACC (2021-2023)
Chunyuan Qiu, MD, MS (2018-2020, 2020-2022)
Joan J. Ryoo, MD, MSHS (2018–2020)
Navdeep Sangha, MD (2017–2019)
John J. Sim, MD (2016–2018)
Devansu Tewari, MD, MBA (2016–2018)
Emily L. Whitcomb, MD, MAS (2017–2019)
Bechien U. Wu, MD, MPH (2017–2019)
Hui Xue, MD, MMSc (2016–2018, 2018–2020)

Affiliated researchers

Kaiser Permanente affiliated investigators, including active and retired SCPMG partners:

Bradley Ackerson, MD
David Braun, MD
Jeffrey Brettler, MD
Sirichai Chayasirisobhon, MD, FAAN
Suresh Gurbani, MD
David Harmon, MD
Michael Kanter, MD
Annette Langer-Gould, MD, PhD
Ron Loo, MD
Neal Lonky, MD
Eric Macy, MD
Lisa Nyberg, MD, MPH, MS
Jonathan Polikoff, MD
David Sacks, MD
Michael Schatz, MD, MS
Joanne E. Schottinger, MD
Steven Steinberg, MD
Warren Shapiro, MD
Lester Thompson, MD
Robert S. Zeiger, MD, PhD

View current division

Division of Epidemiologic Research

Scientific director

Kristi Reynolds, PhD, MPH

2025 research scientists

Annette L. Adams, PhD, MPH
Jaejin An, PhD
Chun Chao, PhD, MS
Wansu Chen, PhD, MS
Darios Getahun, MD, PhD, MPH
Reina Haque, PhD, MPH
Rulin Hechter, MD, PhD, MS
Matthew T. Mefford, PhD, MPH
Annette Regan, PhD, MPH
Sara Y. Tartof, PhD, MPH
Hung Fu Tseng, PhD, MPH

2025 postdoctoral research fellows

Talar Habeshian, PhD, MPH

Maheen Humayun, PhD, MPH

Nehaa Khadka, PhD, MPH

Amrita Mukherjee, PhD, MPH
Emily Rayens, PhD, MPH

2025 Epidemic Intelligence Service officers

Casey Luc, PhD, MPH*

Rudy A. Patrick, PhD, MPH*

*Dr. Patrick moved into a role as an epidemiologist and Dr. Luc joined R&E in August 2025. 

Investigators from other institutions

Katia Bruxvoort, PhD

View current investigators

Division of Health Services Research & Implementation Science

Interim scientific director

Huong Q. Nguyen, PhD, RN

2025 research scientists

Heidi Brown, MD, MAS (Dr. Brown is also a practicing urogynecologist with SCPMG.)
Karen J. Coleman, PhD, MS
Erin E. Hahn, PhD, MPH
Aniket A. Kawatkar, PhD, MS
Brian S. Mittman, PhD

2025 postdoctoral research fellow

Taynara Formagini, PhD, MSc

View current investigators

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