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Our Leaders

Regenstrief Leadership

Peter J. Embí, MD, MS
President and CEO

Dr. Embí is an internationally recognized researcher, educator, and leader in the field of clinical and translational research informatics, with numerous peer-reviewed publications and presentations describing his innovations in the field. His areas of interest include biomedical informatics, health information technology, patient-centered outcomes and learning health systems. He is also the Associate Dean for Informatics and Health Services Research at the Indiana University School of Medicine, the Associate Director at Indiana CTSI and Vice President for Learning Health Systems at IU Health. He previously served in leadership roles at The Ohio State University. He was also on the faculty of the University of Cincinnati, where he was the founding director of the UC Center for Health Informatics.


Aaron Carroll, MD, MS
Vice President for Faculty Development
Dr. Carroll is Regenstrief’s first Vice President for Faculty Development. He is also a Professor and the Vice Chair for Health Outcomes Research Faculty Development in the Department of Pediatrics at Indiana University School of Medicine and Director of the Center for Pediatric and Adolescent Comparative Effectiveness Research and is the Associate Dean for Research Mentoring, both at the Indiana University School of Medicine.


Shaun Grannis, MD, MS
Vice President for Data and Analytics
Dr. Grannis collaborates closely with national and international public and population health stakeholders to advance the technical infrastructure and data-sharing capabilities in varying settings. His research is focused on improving discovery and decision support in a variety of contexts by developing, testing, and implementing innovative approaches for data integration, patient matching, predictive modeling and other novel data science use cases, including developing novel population health data frameworks supporting fusion of community and social determinants of health with clinical data, as well as leveraging machine learning-based models to improve discovery and decision support in a variety of contexts. Dr. Grannis has been a part of Regenstrief Institute since 2001 when he began a National Library of Medicine sponsored medical informatics fellowship.


Eneida Mendonca, MD, PhDEneida A. Mendonca, MD, PhD
Vice President for Research Development
Interim Director, Center for Biomedical Informatics
As the vice president for research development, Dr. Mendonca is charged with building upon and enhancing the successes of the institute’s faculty investigators across biomedical informatics, health services research, aging research and implementation science.


Todd Saxton, PhD
Vice President for Business Development
Dr. Todd Saxton’s role is to guide new business models for bringing Regenstrief Institute healthcare innovations to market. He also fosters an entrepreneurial culture among the institute’s researchers and affiliates and connects the institute with Indiana University Kelley School of Business’ research and teaching expertise.


Umberto Tachinardi, MD, MScUmberto Tachinardi, MD, MSc
Chief Information Officer, Regenstrief Institute
With more than 30 years of experience in biomedical informatics, Dr. Umberto Tachinardi has a history of successfully developing and implementing health informatics technologies in organizations of all sizes. His leadership will help guide Regenstrief Data Services, help Regenstrief build on the significant progress already achieved by the IU Precision Health Initiative and further strengthen Regenstrief’s partnership with CTSI to leverage data and technologies to accelerate translational research and improve health.


Susan E. Hickman, PHD
Director, Center for Aging Research
Dr. Susan Hickman Hickman is a clinical geropsychologist focused on optimizing the quality of life for older adults through improved decision-making and communication about treatment preferences. Much of her work is in advance care planning. She is nationally recognized for her work to help ensure that patients’ end-of-life treatment preferences are known and honored and is a founding member of the National POLST Paradigm. She has spent nearly two decades studying the model’s effects on end of life care, and her research findings are used across the country to support programs based on the POLST (Physician Orders for Life-Sustaining Treatment) model.
Susan E. HIckman, PhD


David Haggstrom, MD, MASDavid Haggstrom, MD, MAS
Director, Center for Health Services Research
Dr. David Haggstrom focuses on cancer health services research. He is interested in the measurement and improvement of the quality of health care delivery across the cancer continuum. In addition to implementation science, his research interests specifically include personal health records and portals, clinical decision making, and cancer survivorship.


Marjorie Rallins, DPM, MS
Executive Director of LOINC® at Regenstrief Institute
Marjorie Rallins, DPM, MS, is a nationally recognized leader in health data standards and informatics. She began her duties with LOINC® at Regenstrief Institute January 11, 2021. She previously served as vice president and chief scientific officer of the PCPI® Foundation in Chicago as well as director of clinical informatics for the American Medical Association. Her proven experience in a unique combination of clinical research, business development and thought leadership positions LOINC® to continue facilitating healthcare interoperability at a crucial time for public health.


Deborah Stombaugh, MS
Chief Financial Officer
Deb Stombaugh advises the president and board of directors on all matters pertaining to financial policy, manages the day-to-day administration of accounting, financial reporting and payroll functions as well as overseeing grants and contracts management. She holds a bachelor’s degree from North Park University in Chicago and a master of science in management from the Krannert Graduate School of Management at Purdue University. She previously served as vice chair for clinical and academic administration in IU School of Medicine’s Department of Medicine.


Joyce Hertko, PhD, MS
Chief Operating Officer
Dr. Hertko earned a B.A. from Knox College, an M.S. from Western Illinois University and a PhD in Higher Education Administration from Indiana University Bloomington. She has extensive knowledge in operations having previously served as Director of Community Outreach and Engagement at IU Health and as President and CEO of the Ruth Lilly Health Education Center.
Joyce Hertko, PhD

Regenstrief Board of Directors

Chairman – D. Craig Brater, MD
President – Peter Embi, MD, MS
Treasurer – Patricia Martin, MBA
Secretary – Joyce Hertko, PhD, MS

Virginia Caine, MD
Tatiana Foroud, PhD
Jay L. Hess, MD, PhD, MHSA
Michelle Janney, PhD, RN
Lisa E. Harris, MD
John P. Kansky, MSE, MBA
Claire Fiddian-Green, MBA
Sarah Wiehe, MD, MPH

Life Directors
Leonard J. Betley
Harvey Feigenbaum, MD
Jack Snyder