To be the featured person in an event. Two professors from New York University are heading the bill at the conference on climate change this weekend.Up until now he's only been a supporting act, but he's going to head the bill for the first time next Saturday.See also: bill, head
head/top the ˈbill
be the most important item or performer in a show, play, etc: Topping the bill tonight will be Robbie Williams.See also: bill, head, top