Tony Vinciquerra, 48, is a man with an expanding portfolio. Hired in December 2001 to run the business operations as president of the Fox Television Network, he more than doubled his responsibility six months later when he was given a newly created title, president and CEO of the Fox Networks Group. The job folded the business operations of Fox’s wide assortment of cable properties under his oversight and he has begun assembling a senior management team that spans both sides of the sprawling territory.