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Big shakeup at HBO: Longtime programming president Michael Lombardo is stepping down.

The executive is exiting after a 33-year run at the network, which includes championing HBO’s all-time biggest hit, Game of Thrones.

Variety first reported the news and says the executive “was not pushed.” But it’s fair to say HBO has struggled to find breakout dramas in recent years, with the recent Vinyl underperforming and the second season of True Detective disappointing, plus there’s been production troubles with the upcoming Westworld.

No word yet on Lombardo’s successor. The executive is expected to make a production deal with the network moving forward.