evidence: Even those who considered him a friend didn’t know for certain that Campbell was the personal chef for one of the most recognizable families in the world. Rahman "Rock" Harper, chef and founder of Queen Mother’s Fried Chicken in Arlington, Va., had known Campbell when he worked at the White House, where he cooked for two presidents as a sous chef from 2007 to 2016. Campbell left the White House to work for the Obamas, but Harper had to determine that on his own. [...] The tributes started appearing on social media and elsewhere as word of Campbell’s death spread. The Obamas called him a "beloved part of our family." Derrick Wood, the mayor of Dumfries, Va., where Campbell and his wife and family lived, called him "a talented chef, father, husband, and a passionate soul." Sam Kass, a former White House chef and policy adviser, called Campbell "as kind, gentle and decent man as I have met. I never saw him stressed or flustered, he just always quietly handled his business."