NEW YORK — Richard Parsons, one of corporate America’s most prominent Black executives who held top posts at Time Warner and Citigroup, died Thursday. He was 76. Parsons, who died at his Manhattan home, was diagnosed with multiple myeloma in 2015 and cited “unanticipated complications” from the disease for cutting back on work a few years later. The financial services company Lazard, where Parsons was a longtime board member, confirmed his death. David Zaslav, the president and CEO of Time Warner successor Warner Bros. Discovery, remembered Parsons as a “great mentor and friend” and a “tough and brilliant negotiator, always