Since 2013, the Commonwealth Fund’s Health Care Delivery System Reform program has focused on ways to improve health care and outcomes for two populations: high-need, high-cost patients (including frail elders, the disabled, and those with multiple chronic conditions) and vulnerable populations, or those with low incomes. We spoke with Pamela Riley, M.D., M.P.H., who directs the portfolio of grants focusing on vulnerable populations, about her strategy for this area of work and what she’s accomplished so far.