A 12-year HBO veteran, Bloys has been on a fast track at the pay channel. He was promoted to president of series, late night and specials in January. At the time, head of drama development Michael Ellenberg left the network.
Prior to that Bloys oversaw comedy series, including the gestation of such shows as "Veep" (last year's Emmy winner) and "Silicon Valley."
Bloys, 44, takes over at a moment when HBO is in need of replenishing its lineup of shows. The mega-hit "Game of Thrones" is heading into its last two seasons, and the half-hour "Girls" will end after its next season.
In addition, some recent offerings have been disappointments, either creatively or in terms of audience, including the expensive music drama "Vinyl" and second season of "True Detective." An eagerly anticipated version of "Westworld" was also delayed.