Effect.GetOwnerPlayer 
Source Code | Usage Examples | Effect Functions
Returns the controller of the owner of the effect (Effect e). If the effect is registered to a player, it returns the player it's registered to instead. If the owner was changed by Effect.SetOwnerPlayer, then it will return the value set by that function.
Signature 
Effect.GetOwnerPlayer(Effect e) → int
lua
e:GetOwnerPlayer()