Leadership
ARKOS LEADERSHIP
Meet the Arkos Team
Our highly experienced management team brings decades of experience and best practices from various industries to deliver advanced, innovative solutions to our partners.
John Rittenour
CHAIRMAN of the BOARD of DIRECTORS
An Arkos Health co-founder and serial entrepreneur, John has founded and operated various post-acute provider, technology, primary care clinic, and laboratory companies.
Jerry Williamson
Chief Executive Officer
An Arkos co-founder with 30 years of experience operating community care organizations and delivering value-based care. A serial entrepreneur having founded over a dozen healthcare companies, including USHS.
Amish Purohit, MD, MBA, MHA, FAAFP, FACHE
PRESIDENT AND CHIEF HEALTH OFFICER
An Arkos co-founder and 25-year veteran of leading managed care and population health management services, including as CEO for USHS, CMO for Heritage Provider Network, and CEO of an Indian Health Services MCO.
Aaron Duerksen
CHIEF GROWTH AND BUSINESS OFFICER
An Arkos co-founder with 25 years of experience in medical device, health information technology and pharmaceutical industries, including roles as CEO of VIZI and as a senior executive at GE, Cardinal Health and Care Innovations, an Intel/GE joint venture.
Scott Lipsitz
CHIEF FINANCIAL OFFICER
An Arkos co-founder with 30 years of experience in capital markets, transaction services and start-up financing, including roles with Rainmaker Capital, One Equity Partners and Genband (Ribbon Communications).
Jeffrey Singman
GLOBAL TECHNOLOGY OFFICER
Joined Arkos in 2023 with more than 30 years of experience in leading technology organizations in healthcare, cyber security, artificial intelligence, analytics, mobility, SaaS, collaboration, and other advanced technologies and services.
Tanya Sibrava, DO, MBA
EXECUTIVE VICE PRESIDENT MEDICAL AFFAIRS
Dr. Sibrava is a board-certified internist with 15-years experience in clinical practice, population health, and managed care services at Cigna Health, Sound Physicians, Arizona Priority Care, and Adobe Health.
Praveen Jayakumar, MD, MS, FACP, CPE
CHIEF MEDICAL OFFICER
Dr. Jayakumar is a board-certified internist who has more than 20 years of experience leading clinical teams and in developing innovative value-based care models in organizations such as Iora Health and the Culinary Health Fund.
Eric Tanner
CHIEF OPERATING OFFICER
15 years of operational experience at leading care organizations, including as CEO of OnPointe, a post-acute provider. Eric is a national speaker, advocating industry disruption using value-based care models.
Victoria Paris
SENIOR VICE PRESIDENT HUMAN RESOURCES
For over 16-years, Victoria has led and contributed to employment departments at both major, and start-up healthcare companies including Healthcare Corporation of America (HCA), Texas Health Resources, Ernest Health, and Onpointe.
Troy Lockman
VICE PRESIDENT CORPORATE COMPLIANCE
A U.S. Air Force veteran, Troy has 20 years of healthcare compliance experience with the Arizona Department of Health Services behavioral health programs, the durable medical equipment industry, and Falck, a global leader in ambulance services.
Who Arkos Health Serves
We act as an extension of our payer partners, working directly with local providers and patients to deliver personalized, comprehensive care.
For Payers
We partner with payers to transform their fee-for-service and upside-only provider network into fully integrated value-based care delivery systems.
For Patients
We believe in a patient-first world, creating a more seamless care experience, investing in patients’ well-being and earning trust through better health outcomes.
For Providers
We collaborate with providers to improve their clinical and operational benchmarks, reduce administrative burden, extend care services, and bridge gaps in care for patients.