Short answers, pulled from the story.
Hubert van Eyck likely entered the world in Maaseik, a town now located within Belgium's Limburg province. Records from 1409 identify him as Magister Hubertus Pictor receiving payment for church panels in Tongeren.
Hubert died on or before the 18th of September 1426 at approximately thirty years old. He was buried in Saint Bavo's Cathedral next to his sister Margareta according to sixteenth-century writer van Vaernewijck.
The resulting altarpiece remained unfinished until six years after his death when Jan completed it in 1432. An inscription once declared Hubert maior quo Nemo reports meaning greater than anyone started the work while Jan later called himself arte Secundus or second-best in art upon finishing the project.
Art historian Bryson Burroughs wrote in 1933 that Hubert created the underdrawing for the Ghent Altarpiece while Jan painted over it. Various techniques now distinguish Hubert's initial sketches from Jan's completed surfaces despite modern scientific investigations revealing changes between finished layers and lower painted levels.
Scholars have debated dividing surviving works between Hubert, early Jan, and other painters for five centuries. Drawings in Vienna's Albertina museum depicting Apostles continue to be attributed to him while British Museum holds copies of lost Capture of Christ scenes related to parts of the altarpiece.