Nexus Health Systems announced Tuesday that Erin Cassidy will be the next chief executive officer. The health system said in a press release that her appointment marks a natural evolution of Nexus’s leadership as it continues its commitment to whole-person, integrated care for young people with complex medical needs. Nexus Health Systems provides specialty care for patients with medical, behavioral and psychiatric needs based in Houston, Texas. Cassidy joined Nexus Health in 2008 and has served