Key People

George W. Brett, MD  

Senior Vice President, Consulting Services/ Chief Medical Officer

Dr. Brett has more than 30 years of experience in geriatric medicine and long-term care. Prior to joining Capstone Performance Systems in 2014, he served as the medical director for LIFE programs at Lutheran Senior Life in Western Pennsylvania. (LIFE  — Living Independence for the Elderly — is part of the National PACE Program.) As a private practitioner for more than two decades, Dr. Brett specialized in internal medicine and geriatrics and served as medical director for several long-term care facilities, hospice organizations, and PACE. His work with PACE led to his interest  and expertise in Medicare risk adjustment. He is a frequent presenter on topics including polypharmacy in the elderly and risk adjustment.


George W. Brett, MD

John C. Stolze

Senior Vice President, Business Success

John Stolze has more than 25 years of experience leading, directing and developing primary and multi-specialty physician practices and groups; clinics; managed care contracting associations; care management teams; and community-based delivery systems. He has an in-depth understanding of the operations side of PACE, accountable care organizations and physician groups with a strong suit in value-based care.  As director of operations and population health for a physicians’ organization in St. Louis, MO, he established a population health management division and collaborated with the St. Louis Physician Alliance (SLPA), to create and lead a Medicare ACO post-acute care management program and a preferred facility network. John joined Capstone in 2017 where he oversees the Planning, Management and Development unit and the PACE Technical Assistance Center.


Capstone Performance Systems

David Wilner, MD, FACP, AGSF

Senior Medical Consultant

 Dr. David Wilner has extensive experience in geriatric medicine. A clinical professor at University of Massachusetts Medical School, Dr. Wilner previously served as medical director and vice president of Summit ElderCare, a PACE program, and Fallon Health and as coordinator of geriatric medicine training at St. Vincent’s Hospital in Worcester, Mass. He is a past member of the National Pace Association (NPA) board of directors and former chairman of the NPA’s Primary Care Committee. Dr. Wilner is board certified in geriatric medicine, hospice and palliative medicine, and internal medicine. 
David Wilner

Angie Hlad, C.R.N.-C.

Director, Coding and Auditing

Angie Hlad has an extensive understanding of ICD10 coding and HCC reimbursement and more than ten years of nursing experience.  She previously served as a reimbursement coordinator for a PACE program, where she focused on coding as well as on educating providers and staff on reimbursement principals. She also spent five years as a registered nurse assessment coordinator, and is a current member of The Nursing Honors Society.

Angie Hlad, CRN-C

Indira Kanouka, MD

Medical Consultant

Dr. Indira Kanouka was graduated from Aleppo University Medical School and completed her internal medicine residency at Monmouth Medical Center in Long Branch, New Jersey. She is board certified in Internal Medicine and has cared for patients in multiple clinical settings, including Federally Qualified Health Centers, Long Term Acute Care hospitals, and the Program of All-Inclusive Care of the Elderly. She has served as a Medical Director in both the LTAC and PACE programs and has provided education to medical residents, nurse practitioners and physician assistants in these various settings and roles. Since joining Capstone Performance Systems in 2018 as a Medical Consultant, Dr. Kanouka provides education in the optimal identification, diagnosis, and documentation of conditions occurring in the older adult to clinicians working in Medicare risk adjustment.

Indira Kanouka, MD

Matthew Zimmerman

Director, Strategic Products and Services

Matthew Zimmerman plays a key role in providing services to support clients through meaningful analyses of their data. He has over 20 years of experience in Medicare Part D management and PACE, previously managing all risk adjustment processes for one of the largest PACE organizations in the country. Matthew has managed and developed internal process standards, policies and procedures, regulatory requirements, and adaptations to CMS changes.

Matt Zimmerman