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533 Parnassus Avenue, Rm 109 UCSF Box 0125 San Francisco, CA 94117

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Associate Professor

Dr. David O'Riordan is an Associate Professor in the Division of Palliative Medicine at the University of California, San Francisco. He is a public health scholar with a PhD from the University of Queensland, Australia, with expertise in instrument development, multi-method study design, and the application of social ecological models to promote positive health behavior change.

Dr. O'Riordan's research spans three areas: patient-level clinical research, institutional and programmatic research, and program evaluation. Working closely with clinical teams, he addresses a broad spectrum of patient outcomes, ranging from disease-specific conditions including neurological disorders, ALS, heart failure, renal disease, and liver disease, to symptom-focused challenges such as pain, anxiety, dyspnea, and depression.

His institutional and programmatic research examines the structure and characteristics of palliative care services across inpatient, outpatient, and pediatric settings, contributing to national benchmarking efforts through the Palliative Care Quality Network and guiding the sustainable expansion of palliative care programs across the United States.

Equity is central to Dr. O'Riordan's work. He has collaborated on projects examining disparities in access to palliative care across diverse populations and on the development of validated screening tools to identify patients with unmet palliative care needs.

Dr. O'Riordan applies the RE-AIM framework (Reach, Effectiveness, Adoption, Implementation, and Maintenance) to evaluate quality improvement and educational interventions, assessing not just whether interventions work but whether they reach those who need them most and can be sustained over time.

He is also committed to mentoring the next generation of researchers, serving as an Inquiry Advisor and DCR Small Group Leader at UCSF, guiding medical students through the design and execution of original scholarly projects.
Education
PhD, 2001 - Public Health, University of Queensland
MHSc, 1995 - Public Health, Queensland University of Technology
BEd, 1993 - Education, Queensland University of Technology
Publications
  1. Postier AC, Root MC, O'Riordan DL, Pantilat SZ, Friedrichsdorf SJ, Bogetz JF. Inpatient Symptom Prevalence, Severity, and Improvement in Children Referred for Pediatric Palliative Care Consultation: Findings from a Multisite Quality Improvement Registry. 2025. PMID: 40998088


  2. Mehta AK, Kojimoto G, O'Riordan DL, Leavell YL, Maiser S, Grouls A, Smith AK, Pantilat SZ, Kluger BM, Bischoff KE. Patients' and Caregivers' Perceptions of Specialty Palliative Care for Amyotrophic Lateral Sclerosis: A Multicenter Evaluation. 2025. PMID: 40827427


  3. Bischoff KE, Kojimoto G, O'Riordan DL, Leavell YL, Maiser S, Grouls A, Smith AK, Pantilat SZ, Kluger BM, Mehta AK. Strengths and Opportunities: Clinicians' Perspectives on Palliative Care for Amyotrophic Lateral Sclerosis (ALS) in the United States. 2025. PMID: 40501419


  4. Melo V, Vanegas G, O'Riordan DL, Kuruvilla P, Pantilat SZ, Rabow M, Chen LM, Bischoff KE. A population health approach to assessing for and addressing palliative care needs in outpatients with advanced gynecologic malignancies. 2025. PMID: 40479982


  5. Nattinger C, Nouri S, O'Riordan DL, Rabow MW. Disparities Among Asian and Black Patients with Cancer in Receipt of Palliative Care in a Single Urban Academic Cancer Center. 2025. PMID: 40425025


  6. Brown CK, Schoenherr LA, Pantilat SZ, Wallace CL, Sumser B, Peck S, O'Riordan DL. Psychosocial Screening by Inpatient Palliative Care Teams: Patient Characteristics and Outcomes. 2025. PMID: 40366206


  7. Bell BK, Cha J, Cavanaugh KA, O'Riordan DL, Rabow MW, Yang AK, Patel S, Park SH, McGrath MK, Whitaker EM, Nouri SS, Cheng SW. Integrative Management of Cancer Pain: A Scoping Review of the Literature. 2025. PMID: 40317896


  8. Makam AN, O'Riordan DL, Heitner R, Bowman B, Spetz J, Pantilat SZ. Palliative Care Services in Long-Term Acute Care Hospitals: A National Survey Study. 2025. PMID: 40139575


  9. Nouri S, Pantilat SZ, Ritchie CS, Lyles CR, Shi Y, O'Riordan D, Boscardin J, Sudore RL. Quality of Virtual versus In-Person Outpatient Palliative Care: Disparities by Language and Race. 2025. PMID: 39756664


  10. Dinh MT, Bell B, Bourgeois JA, Weaver E, Martin J, O'Riordan DL, Rabow M, Kaplan L, Anderson B. The California End of Life Option Act at UCSF: Examining the Utility of the Mandatory Mental Health Assessment. 2024. PMID: 39615629


  11. Schoenherr LA, Goto Y, Sharpless J, O'Riordan DL, Pantilat SZ. A Validated Electronic Medical Record-Based Algorithm to Identify Hospitalized Patients with Serious Illness. 2024. PMID: 39607739


  12. Bischoff KE, Patel K, Boscardin WJ, O'Riordan DL, Pantilat SZ, Smith AK. Prognoses Associated With Palliative Performance Scale Scores in Modern Palliative Care Practice. 2024. PMID: 38976269


  13. Postier AC, Root MC, O'Riordan DL, Purser L, Friedrichsdorf SJ, Pantilat SZ, Bogetz JF. The Pediatric Palliative Care Quality Network: Palliative Care Consultation and Patient Outcomes. 2023. PMID: 38044667


  14. Bischoff KE, Vanegas G, O'Riordan DL, Sumser B, Long J, Lin J, Berkey AR, Kobayashi E, Zapata C, Rabow MW, Pantilat SZ. A Systematic Approach to Assessing and Addressing Palliative Care Needs in an Outpatient Population. 2023. PMID: 37380147


  15. Goss A, O'Riordan DL, Pantilat SZ. Inpatients With Dementia Referred for Palliative Care Consultation: A Multicenter Analysis. 2022. PMID: 36382122


  16. Chapman AC, Lin JA, Cobert J, Marks A, Lin J, O'Riordan DL, Pantilat SZ. Utilization and Delivery of Specialty Palliative Care in the ICU: Insights from the Palliative Care Quality Network. 2022. PMID: 35595374


  17. Bischoff KE, Lin J, Cohen E, O'Riordan DL, Meister S, Zapata C, Sicotte J, Lindenfeld P, Calton B, Pantilat SZ. Outpatient Palliative Care for Noncancer Illnesses: One Program's Experience with Implementation, Impact, and Lessons Learned. 2022. PMID: 35442773


  18. Fahrner-Scott K, Zapata C, O'Riordan DL, Cohen E, Rosow L, Pantilat SZ, Lomen-Hoerth C, Bischoff KE. Embedded Palliative Care for Amyotrophic Lateral Sclerosis: A Pilot Program and Lessons Learned. 2022. PMID: 36157626


  19. van Zyl C, O'Riordan DL, Kerr KM, Harris HA. Doing More with the Same: Comparing Public and Private Hospital Palliative Care within California. 2022. PMID: 35085457


  20. Deng LX, Bischoff KE, Kent DS, O'Riordan DL, Pantilat SZ, Lai JC. Frailty is strongly associated with self-reported symptom burden among patients with cirrhosis. 2021. PMID: 33731588


  21. Deng LX, Kent DS, O'Riordan DL, Pantilat SZ, Lai JC, Bischoff KE. Symptom Burden Is Associated with Increased Emergency Department Utilization among Patients with Cirrhosis. 2021. PMID: 34348042


  22. Cobert J, Cook AC, Lin JA, O'Riordan DL, Pantilat SZ. Trends in palliative care consultations in critically ill patient populations, 2013-2019. 2021. PMID: 34348177


  23. Bischoff KE, Choi S, Su A, Cohen E, O'Riordan DL, Oettel E, Blachman M, Meister S, Zapata C, Lindenfeld P, Calton B, Witt L, Pantilat SZ, Shah RJ. Better Together: A Mixed-Methods Study of Palliative Care Co-Management for Patients with Interstitial Lung Disease. 2021. PMID: 34115958


  24. Calton B, Shibley WP, Cohen E, Pantilat SZ, Rabow MW, O'Riordan DL, Bischoff KE. Patient and Caregiver Experience with Outpatient Palliative Care Telemedicine Visits. 2020. PMID: 34223495


  25. Smith GM, Calton BA, Rabow MW, Marks AK, Bischoff KE, Pantilat SZ, O'Riordan DL. Comparing the Palliative Care Needs of Patients Seen by Specialty Palliative Care Teams at Home Versus in Clinic. 2020. PMID: 33246071


  26. Bischoff KE, Zapata C, Sedki S, Ursem C, O'Riordan DL, England AE, Thompson N, Alfaro A, Rabow MW, Atreya CE. Embedded palliative care for patients with metastatic colorectal cancer: a mixed-methods pilot study. 2020. PMID: 32285263


  27. Liu AY, O'Riordan DL, Marks AK, Bischoff KE, Pantilat SZ. A Comparison of Hospitalized Patients With Heart Failure and Cancer Referred to Palliative Care. 2020. PMID: 32101304


  28. Schoenherr LA, Bischoff KE, Marks AK, O'Riordan DL, Pantilat SZ. Trends in Hospital-Based Specialty Palliative Care in the United States From 2013 to 2017. 2019. PMID: 31808926


  29. Ufere NN, O'Riordan DL, Bischoff KE, Marks AK, Eneanya N, Chung RT, Jackson V, Pantilat SZ, El-Jawahri A. Outcomes of Palliative Care Consultations for Hospitalized Patients With Liver Disease. 2019. PMID: 31326503


  30. O'Riordan DL, Rathfon MA, Joseph DM, Hawgood J, Rabow MW, Dracup KA, De Marco T, Pantilat SZ. Feasibility of Implementing a Palliative Care Intervention for People with Heart Failure: Learnings from a Pilot Randomized Clinical Trial. 2019. PMID: 31099698


  31. Taylor BL, O'Riordan DL, Pantilat SZ, Creutzfeldt CJ. Inpatients with neurologic disease referred for palliative care consultation. 2019. PMID: 30918095


  32. Raghavan K, Copeland TP, Rabow M, Ladenheim M, Marks A, Pantilat SZ, O'Riordan D, Seidenwurm D, Franc B. Palliative care and imaging utilisation for patients with cancer. 2019. PMID: 30826736


  33. Magalhaes S, Banwell B, Bar-Or A, Fortier I, Hanwell HE, Lim M, Matt GE, Neuteboom RF, O'Riordan DL, Schneider PK, Pugliatti M, Shatenstein B, Tansey CM, Wassmer E, Wolfson C. A framework for measurement and harmonization of pediatric multiple sclerosis etiologic research studies: The Pediatric MS Tool-Kit. 2018. PMID: 29932341


  34. Bischoff K, O'Riordan DL, Marks AK, Sudore R, Pantilat SZ. Care Planning for Inpatients Referred for Palliative Care Consultation. 2018. PMID: 29159371


  35. Bischoff KE, O'Riordan DL, Fazzalaro K, Kinderman A, Pantilat SZ. Identifying Opportunities to Improve Pain Among Patients With Serious Illness. 2017. PMID: 29030211


  36. Anderson WG, Puntillo K, Cimino J, Noort J, Pearson D, Boyle D, Grywalski M, Meyer J, O'Neil-Page E, Cain J, Herman H, Barbour S, Turner K, Moore E, Liao S, Ferrell B, Mitchell W, Edmonds K, Fairman N, Joseph D, MacMillan J, Milic MM, Miller M, Nakagawa L, O'Riordan DL, Pietras C, Thornberry K, Pantilat SZ. Palliative Care Professional Development for Critical Care Nurses: A Multicenter Program. 2017. PMID: 28864431


  37. Grubbs V, O'Riordan D, Pantilat S. Characteristics and Outcomes of In-Hospital Palliative Care Consultation among Patients with Renal Disease Versus Other Serious Illnesses. 2017. PMID: 28655708


  38. Pantilat SZ, Marks AK, Bischoff KE, Bragg AR, O'Riordan DL. The Palliative Care Quality Network: Improving the Quality of Caring. 2017. PMID: 28384070


  39. Gordon NA, O'Riordan DL, Dracup KA, De Marco T, Pantilat SZ. Let Us Talk About It: Heart Failure Patients' Preferences Toward Discussions about Prognosis, Advance Care Planning, and Spiritual Support. 2016. PMID: 27603266


  40. Thygeson NM, Wang M, O'Riordan D, Pantilat SZ. Self-Reported California Hospital Palliative Care Program Composition, Certification, and Staffing Level Are Associated with Lower End-of-Life Medicare Utilization. 2016. PMID: 27508981


  41. Pantilat SZ, O'Riordan DL, Rathfon MA, Dracup KA, De Marco T. Etiology of Pain and Its Association with Quality of Life among Patients with Heart Failure. 2016. PMID: 27494139


  42. Beck KR, Pantilat SZ, O'Riordan DL, Peters MG. Use of Palliative Care Consultation for Patients with End-Stage Liver Disease: Survey of Liver Transplant Service Providers. 2016. PMID: 27092870


  43. Kamal AH, Harrison KL, Bakitas M, Dionne-Odom JN, Zubkoff L, Akyar I, Pantilat SZ, O'Riordan DL, Bragg AR, Bischoff KE, Bull J. Improving the Quality of Palliative Care Through National and Regional Collaboration Efforts. 2015. PMID: 26678966


  44. Bertain CJ, O'Riordan DL, Pantilat SZ. Learning from those without: identifying barriers and creating solutions to establishing hospital palliative care services. 2014. PMID: 25523274


  45. Rabow MW, O'Riordan DL, Pantilat SZ. A statewide survey of adult and pediatric outpatient palliative care services. 2014. PMID: 25137356


  46. Reid T, O'Riordan DL, Mazzini A, Bruno KA, Pantilat SZ. Pediatric palliative care consultation services in California hospitals. 2014. PMID: 25299845


  47. Pantilat SZ, O'Riordan DL, Bruno KA. Two steps forward, one step back: changes in palliative care consultation services in California hospitals from 2007 to 2011. 2014. PMID: 25084528


  48. Gomutbutra P, O'Riordan DL, Pantilat SZ. Management of moderate-to-severe dyspnea in hospitalized patients receiving palliative care. 2012. PMID: 22940561


  49. Schenker Y, Fernandez A, Kerr K, O'Riordan D, Pantilat SZ. Interpretation for discussions about end-of-life issues: results from a National Survey of Health Care Interpreters. 2012. PMID: 22788909


  50. Pantilat SZ, O'Riordan DL, Dibble SL, Landefeld CS. An assessment of the screening performance of a single-item measure of depression from the Edmonton Symptom Assessment Scale among chronically ill hospitalized patients. 2012. PMID: 22560356


  51. Lawler S, McDermott L, O'Riordan D, Spathonis K, Eakin E, Leslie E, Gallois C, Berndt N, Owen N. Relationships of sun-protection habit strength with sunscreen use during outdoor sport and physical activity. 2012. PMID: 22690172


  52. Pantilat SZ, Kerr KM, Billings JA, Bruno KA, O'Riordan DL. Characteristics of palliative care consultation services in California hospitals. 2012. PMID: 22394365


  53. Pantilat SZ, O'Riordan DL, Dibble SL, Landefeld CS. Longitudinal assessment of symptom severity among hospitalized elders diagnosed with cancer, heart failure, and chronic obstructive pulmonary disease. 2012. PMID: 22371388


  54. Berger GN, O'Riordan DL, Kerr K, Pantilat SZ. Prevalence and characteristics of outpatient palliative care services in California. 2011. PMID: 21986345


  55. Pantilat SZ, Kerr KM, Billings JA, Bruno KA, O'Riordan DL. Palliative care services in California hospitals: program prevalence and hospital characteristics. 2011. PMID: 21802898


  56. Berndt NC, O'Riordan DL, Winkler E, McDermott L, Spathonis K, Owen N. Social cognitive correlates of young adult sport competitors' sunscreen use. 2011. PMID: 21059896


  57. Pantilat SZ, O'Riordan DL, Dibble SL, Landefeld CS. Hospital-based palliative medicine consultation: a randomized controlled trial. 2010. PMID: 21149765


  58. Glanz K, Gies P, O'Riordan DL, Elliott T, Nehl E, McCarty F, Davis E. Validity of self-reported solar UVR exposure compared with objectively measured UVR exposure. 2010. PMID: 20940277


  59. O'Riordan DL, Nehl E, Gies P, Bundy L, Burgess K, Davis E, Glanz K. Validity of covering-up sun-protection habits: Association of observations and self-report. 2009. PMID: 19278750


  60. Maddock JE, O'Riordan DL, Lee T, Mayer JA, McKenzie TL. Use of sunglasses in public outdoor recreation settings in Honolulu, Hawaii. 2009. PMID: 19156011


  61. O'Riordan DL, Steffen AD, Lunde KB, Gies P. A day at the beach while on tropical vacation: sun protection practices in a high-risk setting for UV radiation exposure. 2008. PMID: 19015419


  62. Glanz K, McCarty F, Nehl EJ, O'Riordan DL, Gies P, Bundy L, Locke AE, Hall DM. Validity of self-reported sunscreen use by parents, children, and lifeguards. 2008. PMID: 18945582


  63. Glanz K, Yaroch AL, Dancel M, Saraiya M, Crane LA, Buller DB, Manne S, O'Riordan DL, Heckman CJ, Hay J, Robinson JK. Measures of sun exposure and sun protection practices for behavioral and epidemiologic research. 2008. PMID: 18283179


  64. O'Riordan DL, Glanz K, Gies P, Elliott T. A pilot study of the validity of self-reported ultraviolet radiation exposure and sun protection practices among lifeguards, parents and children. 2008. PMID: 18179624


  65. Sutton NM, Suzuki TM, Della D, Albright C, O'Riordan DL. Involving Hawai'i's youth as partners in global health initiatives to impact change at the local level. 2007. PMID: 20879470


  66. Maddock JE, O'Riordan DL, Lunde KB, Steffen A. Sun protection practices of beachgoers using a reliable observational measure. 2007. PMID: 17688402


  67. Glanz K, Jarrette AD, Wilson EA, O'Riordan DL, Jacob Arriola KR. Reducing minors' access to tobacco: eight years' experience in Hawaii. 2006. PMID: 17084888


  68. O'Riordan DL, Lunde KB, Steffen AD, Maddock JE. Validity of beachgoers' self-report of their sun habits. 2006. PMID: 17043185


  69. O'Riordan DL, Field AE, Geller AC, Brooks DR, Aweh G, Colditz GA, Frazier AL. Frequent tanning bed use, weight concerns, and other health risk behaviors in adolescent females (United States). 2006. PMID: 16633915


  70. O'Riordan DL, Sutton N. A community-based approach to tobacco prevention: Hawaii's youth taking on the tobacco industry. 2005. PMID: 16379225


  71. O'Riordan DL, Lunde KB, Urschitz J, Glanz K. A noninvasive objective measure of sunscreen use and reapplication. 2005. PMID: 15767357


  72. Geller AC, Shamban J, O'Riordan DL, Slygh C, Kinney JP, Rosenberg S. Raising sun protection and early detection awareness among Florida high schoolers. 2005. PMID: 15804297


  73. Geller AC, O'Riordan DL, Oliveria SA, Valvo S, Teich M, Halpern AC. Overcoming obstacles to skin cancer examinations and prevention counseling for high-risk patients: results of a national survey of primary care physicians. 2004. PMID: 15575033


  74. O'Riordan DL, Geller AC, Brooks DR, Zhang Z, Miller DR. Sunburn reduction through parental role modeling and sunscreen vigilance. 2003. PMID: 12520258


  75. Stanton WR, Chakma B, O'Riordan DL, Eyeson-Annan M. Sun exposure and primary prevention of skin cancer for infants and young children during autumn/winter. 2000. PMID: 10790938


  76. O'Riordan DL, Stanton WR, Eyeson-Annan M, Gies P, Roy C. Correlations between reported and measured ultraviolet radiation exposure of mothers and young children. 2000. PMID: 10649890


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