Jeffrey N. Katz, MD, MSc

Director of OrACORe
Professor of Medicine and Orthopaedic Surgery at Harvard Medical School
The Clement B. Sledge, MD & Thomas S. Thornhill, MD Distinguished Chair in Orthopaedic Surgery
Professor of Epidemiology and Environmental Health at Harvard School of Public Health

Harvard Catalyst


Elena Losina, PhD, MSc

Co-Director of OrACORe
Robert W. Lovett Professor of Orthopaedic Surgery at Harvard Medical School
Associate Professor of Biostatistics at Boston University School of Public Health

Harvard Catalyst


Jamie E. Collins, PhD

Senior Statistician
Assistant Professor of Orthopaedic Surgery at Harvard Medical School

Harvard Catalyst


Faith Selzer, PhD, MPH

Epidemiologist and Program Manager
Instructor in Orthopaedic Surgery at Harvard Medical School

Harvard Catalyst

Andrew Schoenfeld

Andrew J. Schoenfeld, MD, MSc

Clinical Investigator
Assistant Professor of Orthopaedic Surgery at Harvard Medical School

Harvard Catalyst


Lindsey A. MacFarlane, MD, MPH

Clinical Investigator
Instructor in Medicine at Harvard Medical School

Harvard Catalyst



Kaetlyn Arant

Research Assistant
Amherst College, 2019
BA in Biochemistry & Biophysics and French

Current Projects: TeMPO, SHielD, MeTeOR, and STriDeS
Contact Information:

Kaetlyn splits her time among several projects at OrACORe, though she spends a majority of her time working on the TeMPO study. She is responsible for patient recruitment in clinic and the performance of musculoskeletal exams and quantitative sensory testing. Additionally, Kaetlyn is investigating the association between adiposity and inflammation in knee osteoarthritis alongside Dr. MacFarlane. Kaetlyn is helping Dr. MacFarlane to initiate her project and will be involved in subject recruitment. She also collects data for the SHielD study and performs qualitative analysis of physician interviews for STriDeS.

Peter Bensen

G. Peter Bensen

Research Assistant
Bowdoin College, 2018
BA in Mathematics

Current Projects: OAPol, SHielD, and STrIDeS
Contact Information:

Peter works on three projects that involve both quantitative and qualitative research. He spends the majority of his time working on OAPol. He focuses on validating and debugging the model as well as performing data updates to ensure that both model inputs and outputs reflect the most recently published data from clinical studies as well as national surveys. Finally, he works to improve the model by adapting the infrastructure already in place to accommodate a greater diversity of covariates such as depression. Additionally, Peter collects data for both the SHielD and STrIDeS studies and works on the STrIDeS data analysis team focusing on cost-effectiveness and creating decision analysis trees using TreeAge software.


Corin Bronsther

Research Assistant
Columbia University, 2018
BA in Biology and East Asian Studies

Current Projects: OAPol, TeMPO, and ORBIT
Contact Information:

Corin is mainly involved in three projects: TeMPO, ORBIT, and OAPol. In both TeMPO and ORBIT, Corin is involved in the patient-facing aspects, which include recruiting participants in clinic and conducting musculoskeletal exams.


Jamie Huizinga

Research Assistant
University of Michigan, 2018
BS in Cell & Molecular Biology

Current Projects: OAPol, TeMPO, ORBIT, AViKA, and STARs
Contact Information:

Jamie’s role in the TeMPO trial involves recruiting patients in clinic, coordinating with three other medical centers that are a part of the trial, and incorporating quantitative sensory testing into the trial. She was a part of launching ORBIT, a registry of patients with osteoarthritis, which currently is scheduling follow-up visits for its first participants. For the OAPol project, Jamie works on validating the model and investigating the societal costs of opioids for people with knee osteoarthritis. Jamie has been a part of concluding the questionnaire collection stage of the AViKA/STARs projects.

Valia Leifer

Valia Leifer

Research Assistant
Harvard College, 2019
BA in Molecular & Cellular Biology and English

Current Projects: OAPol
Contact Information:

Valia spends most of her time developing and validating model structure for the OAPol Project. Her three main projects involve implementing a bariatric surgery module, developing a strategy for modeling subjects’ lifetime BMI progressions, and devising new methods of modeling complex clinical scenarios and treatment sequences using existing model structure. She is also involved in data collection for the SHieID study and clinical trial development for the KArAT study.

Nora Lenhard

Nora Lenhard

Research Assistant
Middlebury College, 2018
BA in Political Science

Current Projects: OAPol, TeMPO, SHielD, INJECT, and MeTeOR
Contact Information:

Nora works on several qualitative projects, including conducting and analyzing focus groups and interviews for INJECT and working on an analysis with collaborators on upper extremity transplantation. She recruits patients for the TeMPO trial and helps them get started on their assigned interventions. For OAPol, Nora works on a project related to optimizing pain management in persons with knee OA and depression. She also collects data for the SHielD study.


Chloe Schulze

Administrative Assistant
University of New Hampshire, 2017
BA in Sociology

Contact Information:

Version 2

Karen C. Smith

Research Assistant
Amherst College, 2015
BA in Biology and French

Current Projects: OAPol
Contact Information:

Zoey Song

Zoey Shuang Song

Data Analyst
Boston University, 2018
MPH in Epidemiology and Biostatistics
China Agricultural University, 2015
DVM in Veterinary Medicine

Current Projects: OAPol, TeMPO, ORBIT, and SHielD
Contact Information:

Zoey is working as the statistician and data manager for TeMPO, SHielD, ORBIT, and OAPol. Her research interests include adopting machine learning methodology to define fast progressors and classify different phenotypes in knee osteoarthritis.

Liz Stanley

Liz Stanley

Research Assistant
Princeton University, 2018
BSE in Chemical & Biological Engineering

Current Projects: OAPol and SHielD
Contact Information:

Liz works on the OAPol Project and the SHielD Study. She facilitates data collection for SHielD. For OAPol, she is involved in a project investigating the cost effectiveness of antibiotic use prior to dental appointments to prevent prosthetic joint infection among patients at high risk of infection. She also works on a project that aims to characterize the burden of osteoarthritis in the US population. She mentors and assists the other OAPol research assistants in their projects.


Emma Williams

Research Assistant
Cornell University, 2019
BA in Biology and Government

Current Projects: TeMPO, INJECT, and OAPol
Contact Information:

Emma splits her time between the TeMPO trial and the OAPol model, in addition to various qualitative research projects. She is involved in most patient-facing aspects of TeMPO, including patient recruitment, musculoskeletal examination, and quantitative sensory testing. When she isn’t in clinic, Emma contributes to OAPol model validation and debugging. She will also be using the model to investigate the cost effectiveness of arthroscopic partial meniscectomy. As part of INJECT and other qualitative projects, Emma assists in conducting and analyzing interviews with health care providers and patients to better understand treatment decision-making.


Heidi Yang, MS, MPH

Boston University, 2014
MPH in Epidemiology and Biostatistics
Georgia Institute of Technology, 2010
MS in Economics
Shanghai Jiaotong University, 2008
BS in Economics

Current Projects: AViKASTARs, OAPolSPARKS, B-Well, TeMPO, MeDOA, and MeTeOR
Contact Information:

Heidi has ongoing statistical analyses across a variety of studies. Using the AViKA study data, Heidi is working to identify trajectories of pain and function improvement 6 months after TKA, as well as studying associations between pre-operative X-ray features and TKA outcomes. She has worked on issues related to physical activity measurement: validating different accelerometers and identifying thresholds to measure moderate-to-vigorous physical activity. Heidi has also been instrumental in several other studies, including SPARKS and MeTeOR.


Michael Zarra

Research Assistant
Trinity College, 2019
BS in Neuroscience

Current Projects: OAPol, TeMPO, ORBIT, and SHielD
Contact Information:

Michael works on OAPol model validation and debugging to more accurately predict the progression of osteoarthritis in individuals and their related outcomes. For the TeMPO and ORBIT studies, he facilitates recruitment and patient visits, conducting musculoskeletal exams and functional tests, as well as, helping to coordinate behind the scenes management of these projects. His work on SHielD is aimed at enhancing data collection. Michael is interested adapting health policy to allow efficacious treatment to reach underserved populations in ways that are meaningful to them.


Agarwal Harding

Kiran J. Agarwal-Harding, MD

Postdoctoral Training Fellow
BS, Stanford University
MD, Harvard Medical School
PGY5, Harvard Combined Orthopaedic Surgery Residency Program
MPH Candidate, Harvard T.H. Chan School of Public Health

Contact Information:

Kiran’s research interests are in the delivery of affordable and high quality orthopaedic trauma care in low resource settings. He is currently investigating the capacity to deliver orthopaedic trauma care and the financial impact of musculoskeletal trauma for the rural poor in Malawi.


Angel M. Reyes

T-32 Predoctoral Training Fellow
BS, Stanford University 2015
MD Candidate, Harvard Medical School

Contact Information:

Angel’s interests include healthcare disparities, global health, and improving outcomes in underserved communities. He is currently analyzing the national use of spinal fusion by patient sociodemographics and writing a chapter on disparities in the management of osteoarthritis.