In the case of WB&TS of Penn it is Harold Corkern. Not sure when he took over but his predecessor was Robert Ciranko who was rumoured to have died of Covid. This proved to be untrue and in fact he is on a very recent video.
Even the "real" presidents have been demoted in WT history. Knorr was recently referred to in a video as "one of those taking the lead at that time".
The GB are the rulers even though in 1971 when the GB was founded they were supposed to be in charge of the spiritual things and the directors etc would run the companies. See 15 December 1971 WT.
George