HCCI Leadership & Team

HCCI Leadership

Meet the leadership team driving the expansion of home-based primary care across the U.S.
Julie Sacks

Julie Sacks


Chief Executive Officer

Melissa Singleton

Melissa Singleton


Chief Operating Officer

Dr. Tom Cornwell


Chief Medical Officer

Education and Practice Development

Tirza Lofgreen


Director, Education

Raabiah Ali

Raabiah Ali


Program Manager

Sales and Business Development

Heidi Ruhe


Director, Market Growth & Strategic Partnerships

Research and Analytics

Aaron Yao

Aaron Yao, PhD


Director, Research & Analytics

Peter Shewmaker

Peter Shewmaker


Data Scientist

Marketing and Development

Whitney Plunkett​

Whitney Plunkett


Director, Impact & Engagement

Interested in Joining the HCCI Team?

At HCCI, every member of our team is critical to achieving our mission of bringing essential healthcare services to vulnerable individuals at home. If you are committed to making a difference in the future of healthcare, HCCI invites you to further explore the possibility of joining our team.

Julie Sacks

President & Chief Executive Officer

Julie Sacks is the president and chief executive officer of the Home Centered Care Institute (HCCI), a national nonprofit organization focused on scaling home-based primary care and bringing it into the healthcare mainstream. In the role, Sacks is responsible for evaluating strategic opportunities and partnerships, developing relationships with donors and foundations, and serving as spokesperson for the organization, in addition to serving as the primary liaison to the HCCI board of directors.

Since joining HCCI in 2015 as vice president of operations and advancement, Sacks has orchestrated the development and implementation of the organization’s annual plan and strategic roadmap, while managing HCCI’s executive team and the organization’s daily operations.

Prior to joining HCCI, Sacks was senior director of programs and services and director of the National Young Onset Center for the American Parkinson Disease Association. She graduated with a bachelor’s degree in advertising from the University of Texas at Austin, and then earned a master’s degree in social work from the University of Texas at Arlington.

During Sacks’ tenure at HCCI, the organization has made significant strides toward creating universal access to house call programs and advocating on behalf of home-based primary care (HBPC). With Sacks’ support, the organization participated in a campaign that resulted in the continuation of the Centers for Medicare & Medicaid Services Independence at Home Medicare Demonstration and development of new payment models for home-based care.

Melissa Singleton

Chief Operating Officer

With over 25 years of experience in continuing medical education (CME) and health care quality improvement, Singleton has held senior staff positions at medical specialty societies and has also served as an executive consultant to health care organizations at national and state levels. She has a graduate degree in adult professional education/human resource development and brings extensive knowledge and expertise in educational design, research, quality measurement, and health care outreach.

In her role as chief operating officer at the Home Centered Care Institute, Singleton oversees the development, implementation, and evaluation of all educational programming, research initiatives, and a wide range of projects, services, and outreach aimed at expanding access to high-quality home-based primary care (HBPC) for patients who need it. She is passionate about leveraging strategic partnerships and working with like-minded collaborators to grow the HBPC workforce and improve the sustainability of house call programs that serve frail, older adults and patients of any age who are medically complex, require advanced care for serious illness, and/or have injuries or conditions causing them to be homebound or home limited.

Tom Cornwell, MD

Chief Medical Officer

Dr. Tom Cornwell is the founder and inaugural CEO of HCCI as well as a physician with 30+ years of experience. He has personally made over 33,000 home visits and, since returning to clinical practice and administration in 2020, has served as Executive Chairman of the Board. Recently named HCCI's Chief Medical Officer, he continues to guide the clinical vision behind the organization's mission to make home-based primary care the national standard for medically complex, homebound patients. 

Raabiah Ali

Program Manager

Raabiah brings a background in public health program oversight, having previously served as Director of Grants Management and Director of Public Health Operations at the Chicago Department of Public Health. Since joining HCCI, she has managed critical pilot projects including the IL House Call Project which has helped prove the value and scalability of home-based primary care. 

Aaron Yao, PhD

Director, Research & Analytics

Aaron is a healthcare researcher with prior experience as a research scientist in geriatrics and instructor at the University of Virginia School of Medicine. He is also the innovator behind HCCI’s Confer Analytics®, the first and only market intelligence tool designed specifically for the home-based care sector. Aaron’s research focuses on value-based care and home-based care outcomes, and he has published extensively in the field.

Peter Shewmaker

Data Scientist

Peter brings a background in biostatistics and applied mathematics, having previously served as a Biostatistician at Brown University School of Public Health and as a mathematics lecturer at the University of Connecticut. His experience spans statistical modeling and data interpretation aimed at improving outcomes for medically complex patients.

Whitney Plunkett

Director, Impact & Engagement

Whitney Plunkett leads HCCI's development, engagement, and marketing efforts, working to build donor relationships and support in furtherance of the organization's mission to expand access to home-based primary care. Whitney is committed to improving patient care in the home. Prior to joining HCCI, Whitney served as Director of Development at the American Heart Association supporting its mission to reduce heart disease and stroke by expanding access to care and promoting health equity.

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