Every year, more than 55,000people in New Jersey rely on one healthcare network — the North Hudson Community Action Corp. (NHCAC) — for their primary care needs. More than half of those patients live in Hudson County, particularly the northern half, and survive on low salaries. Many are immigrants. If there was any doubt about its essentialitybefore 2020, NHCAC was a regional lifeline during the coronavirus pandemic. Next year, it will have a new leader for the first time in more thana decade. Joan Quigley, NHCAC’s president since 2013,announced this week that she will retire at the end of the…