Does it have to be written on an iPad? Apple chief executive Steve Jobs will collaborate on the first-ever authorized biography with former Time magazine managing editor Walter Isaacson, according to unnamed sources in The New York Times. Jobs, who turns 55 this month, has never given a definitive account of his life, though several would-be biographers have tried, much to his frustration. In some cases, he has banned other books from the same publishers as these biographies from Apple store shelves. Isaacson has already written two best-selling biographies about Albert Einstein and Benjamin Franklin, which would put Jobs in elite company. This book is said to be in the early planning stages.