Christina Severin (Community Care Cooperative) Christina Severin is a leading health care executive with more than 20 years of experience and numerous accomplishments in managed care, delivery systems, health insurance, Accountable Care Organizations, quality, public policy, and public health. She has led Community Care Cooperative (C3) since the organization’s launch in 2016, leveraging the proven best practices of ACOs throughout the country, building the organization on the collective strengths of its health centers, and growing the organization to better serve MassHealth members throughout the commonwealth. Christina’s prior leadership experience includes serving as President and Chief Executive Officer of Beth Israel Deaconess Care Organization and as President of Network Health, a nonprofit Massachusetts health plan.