Our Faculty

More than 150 faculty members work within the OHSU-PSU School of Public Health. They have a wide range of expertise, from monitoring and assessing health risks and opportunities in populations, to helping build health-supporting social environments through policy, advocacy, and programs. They are educators, advisors, researchers, practitioners and community leaders. They come from backgrounds in quantitative, behavioral, environmental and social sciences, policy and government, exercise and health sciences and anthropology, among many other areas. They all work in collaboration with each other and with community partners, and are especially focused on the training and education of future leaders and practitioners in the public health fields.



  • The results are being filtered by the department: Epidemiology


Andresen, Elena - MA, PhD

Photo of Elena Andresen MA, PhD
Professor Epidemiology Office OHSU – CSB 682; Baird Hall Suite 1011 Phone: (503) 494-4460

Elena Andresen was appointed interim provost for OHSU on Oct. 1, 2016. She previously served as interim dean of the School of Public Health, from  May 2014 to September 2016, and continues as professor of epidemiology at the School of Public Health. Andresen also is the principal investigator and director of the Oregon Office on Disability and Health at OHSU. The office has a long history at OHSU of working on behalf of Oregonians with disability and their families.

Andresen joined OHSU in 2011 after serving as professor and the founding chair of the Department of Epidemiology and Biostatistics at the University of Florida College of Public Health and Health Professions. She is an experienced epidemiologist who received additional training in health services research. Her recent work has focused on aging and the public health outcomes of disability across the lifespan, along with methods and measures for health services outcomes research.

Education, Degrees

M.A., University of Washington, 1976
Ph.D., University of Washington, 1991

Awards and Honors
  • 2011, Allan Meyers Award, American Public Health Association Disability Section, 2011
  • 2010, Member Delta Omega Honorary Society in Public Health (Beta Upsilon Chapter)
  • 2000, Honorary Member, Pi Theta Epsilon, OT Honor Society (Beta Gamma Chapter)
  • 1995, Alumni Award for Excellence in Graduate Education, University of Rochester
  • 1988, Matrix Table Award for Campus Achievement, Women in Communications, Inc.



Horner-Johnson, Willi - PhD

Photo of Willi Horner-Johnson PhD
Associate Professor Epidemiology Office OHSU – CDRC 1272C Phone: (503) 494-9273

Willi Horner-Johnson is an associate professor in the School of Public Health and in OHSU’s Institute on Development and Disability. She studies health and health care disparities impacting adults with disabilities and has contributed to a growing body of evidence indicating substandard receipt of some types of preventive care and elevated levels of unmet health care needs in the disability population.

Horner-Johnson has a particular interest in disparities experienced by people with disabilities who also belong to other marginalized groups. In 2014, she guest edited a special issue of Medical Care on health care disparities at the intersection of disability, race and ethnicity.

Much of her current research focuses on reproductive health of women with disabilities, including contraception use and preferences and pregnancy occurrence and outcomes.

Horner-Johnson co-founded the Disability Section of the Oregon Public Health Association and is currently chair of the Disability Section of the American Public Health Association.

Education, Degrees

B.A., Oberlin College, 1995
Ph.D., University of Illinois at Chicago, 2002

Awards and Honors

2009, APHA Disability Section New Investigator Award

  • K12 HS019456 (Guise, JM)   09/01/2014 – 07/31/2017  AHRQ  Oregon Patient Centered Outcomes Research K12 Program, Role: K12 Scholar
  • R21HD081309 (Horner-Johnson, W)    07/25/2014 – 06/30/2017 , NIH/NICHD, Prevalence and Outcomes of Pregnancy in Women with Disabilities, Role: Principal Investigator


McGregor, Jessina - PhD

Photo of Jessina McGregor PhD
Associate Professor Epidemiology Office South Waterfront – CLSB 5S088 Phone: (503) 494-4722

Jessina McGregor is an epidemiologist whose research over the last 10 years or more has focused on antibiotic utilization, antimicrobial stewardship, multidrug-resistant organisms and healthcare-associated infections. McGregor is currently engaged in several federal, foundation, and industry-funded research projects, including federally sponsored research that aims to reduce excess fluoroquinolone prescribing for urinary tract infections in primary care settings.

Education, Degrees

B.A., International Studies, Oregon State University, 2001
B.S., Microbiology, Oregon State University, 2001
Ph.D., Epidemiology, University of Maryland, Baltimore, 2005

  • 1 R01 HS022706 – 01A1 (McGregor) 9/30/2014 – 9/29/2017,2.4 calendar months, AHRQ, $288,978,  Improving empiric therapy in ambulatory care.  Study aims to develop risk score that can inform prudent and appropriate antibiotic selection for uncomplicated urinary tract infections in primary care settings.
  • IFRA-0253 (Furuno, McGregor) 7/29/2016 – 7/31/2017 1.0 calendar months Merck,   $90,058.  A retrospective cohort study of the safety and effectiveness of posaconazole for prophylaxis of invasive fungal infections among immunocompromised patients.
  • 1009006_OSU (McGregor/Hartung) 1/1/2016 – 12/31/2021 2.4 calendar months, PCORI          $592,227 (Subaward total funding) Peer Review of PCORI’s Funded Research. The purpose of this project is for Dr. McGregor and Dr. Hartung to serve as editors, reviewing and synthesizing reviewer comments, assessing author response and rating reviewers on timeliness and quality as they pertain to PCORI methodology standards. Role: Associate Editor
  • HC-1510-06870 (Hartung)10/1/2016-9/30/2018 1.3 calendar months NMSS $411,151 Total Costs, Access, and Value of Multiple Sclerosis Disease-Modifying Therapies Evidence generated from this study can be used by NMSS and other MS stakeholders better advocate for policies to mitigate problems associated with the high costs of DMTs in the US., Role: Co-Investigator
  • CMV (Furuno) 1/4/2017-1/3/20180.6 calendar months Merck $94,529 Total. A Retrospective Cohort Study of the Benefits and Burdens of Preemptive Antiviral Therapy for CMV among Hematopoietic Stem Cell Transplant Patients. The goal of this project is to describe transplant modalities, prescribing patterns and clinical characteristics of hematopoietic stem cell transplant (HSCT) patients receiving preemptive antiviral treatment for cytomegalovirus (CMV). Role: Co-Investigator
  • No Number (Pakyz) 9/1/2016 – 8/31/20211.8 calendar months CDC,  $208,406 (subaward total) Development of NHSN’s AUR data and SAAR to support Antibiotic Benchmarking Program among Vizient Members. The goal of this project is to identify the optimal method for disseminating standardized antibiotic utilization data through usability testing among Vizient [formerly University HealthSystem Consortium (UHC)] members.  Role: Subaward PI


Nielson, Carrie - MPH, PhD

Photo of Carrie Nielson MPH, PhD
Associate Professor Epidemiology Office OHSU – HRC 11D32 Phone: (503) 494-4019

Carrie Nielson is an epidemiologist focused on genetic risk factors for osteoporosis and other outcomes of aging that are related to body composition and endocrinology. She and her colleagues work to understand the regulation of bone, fat, and lean mass in older adults in order to prevent frailty and fracture, which lead to immobility and loss of independence. She works primarily on two large cohort studies of aging men and women in the United States, using genotyping in these cohorts to explore genetic variants that may affect bone mineral density and other traits. 

2017 EpiData Research Symposium Spotlight

Education, Degrees

M.P.H., University of Arizona, 2004
Ph.D., University of Arizona, 2006
Postdoctoral Fellowship in Cancer Prevention and Control


O’Neal, Seth - MD, MPH

Photo of Seth O’Neal MD, MPH
Assistant Professor Epidemiology Office OHSU – CSB 658 Phone: (503) 494-0300

Seth O’Neal is an assistant professor of epidemiology in the School of Public Health. He also holds a visiting faculty position at Universidad Peruana Cayetano Heredia in Lima, Peru, and is co-director of the university’s Center for Global Health in Tumbes, Peru.

O’Neal is engaged in research to develop cost-effective and sustainable control interventions for neglected tropical infections in resource-limited settings. His primary focus is on Taenia solium, the pork tapeworm, which is an important cause of preventable epilepsy across much of Latin America, Asia and sub-Saharan Africa. The parasite also perpetuates poverty in these regions by inflicting financial losses on small landowners due to contaminated pork. Through National Institutes of Health and foundation funding, O’Neal conducts community trials of control interventions, as well as clinical and epidemiological studies. His research explores the biological, environmental, social and cultural factors that drive transmission of the parasite, as these affect control interventions.

Education, Degrees

B.A., Northland College, 1994
M.D., OHSU, 2006
M.P.H., OHSU, 2010
Preventive Medicine Residency, OHSU, 2010

Awards and Honors
  • 2010, Fogarty Fellowship in International Clinical Research, National Institutes of Health
  • 2005, Fogarty-Ellison Fellowship in Global Health and Clinical Research, National Institutes of Health
  • R01NS080645 (O’NEAL, SETH) Dec 15, 2013 – Nov 30, 2018 NIH/NINDS Optimizing ring-screening strategy for control of Taenia solium infection Role: Principal investigator
  • Swiss Foundation (O’NEAL, SETH) May 1, 2013 – June 30, 2015 Community-based control of cysticercosis Role: Principal investigator
  • R21AI119439 (O’NEAL, SETH) July 1, 2015 – June 30, 2017 NIH/NIAID Evaluating corralling and the effect of dung beetles on transmission and control of cysticercosis Role: Principal investigator
  • R21NS069275 (O’NEAL, SETH) Aug 15, 2010 – July 1, 2013 Targeted screening for Taenia solium tapeworms Role: Principal investigator
  • KL2RR024141 (MORRIS, CYNTHIA) Dec 15, 2011 – Dec 4, 2013 Taenia solium infection among refugees from Burma Role: Trainee


Snowden, Jonathan - PhD

Photo of Jonathan Snowden PhD
Assistant Professor Epidemiology Office OHSU – CSB 652 Phone: (503) 494 - 0904

Jonathan Snowden is an epidemiologist, an assistant professor in the School of Public Health and in OHSU’s Department of Obstetrics & Gynecology. He also is an associate editor for the national Patient-Centered Outcomes Research Institute.

Snowden’s research focuses on sexual and reproductive health disparities. He evaluates methods and concepts to improve causal inference from observational data, and his trans-disciplinary research sits at the intersection of population health science, clinical practice and health care policy.

Snowden aims to frame research questions that are relevant to the affected populations and that  respect the circumstances of people’s lives, so that research results can promote optimal health in the real world. By more clearly defining variations in the continuum of “normal” healthy sexuality and reproduction, his research aims to preserve optimal health as well as prevent and treat disease.

A cross-cutting focus of his research is the clear communication of novel concepts and methodologies.

Education, Degrees

B.A., Stanford University, 2005
Ph.D., University of California, Berkeley, 2011

Meet our Faculty

David Bangsberg

Founding Dean

Dr. Ryan Petteway – A People’s Social Epidemiologist

Assistant Professor
Office: PSU – URBN 470N