Buddho : The one who knows which is above the mind? A Dhammatalk by Ajahn Chah
The key idea here is not whether there is "someone" who is above the mind. The key point is that it is possible to go beyond mind or above mind.

We are so caught up in the experience created by the mind that we are completely overwhelmed by it. We are completely absorbed in the bubble of experience it creates.

Here, "mind" is the self-constructing, self-perpetuating principle of endless proliferation of "this vs that" and the entire universe of subjective experience that emerges from iterative application of this principle.

But it is possible to cut through the bubble - through the mutually supporting combination of detachment and insight. Being outside the mind means we are not taking its drama seriously anymore. We are dispassionate, disenchanted, disillusioned, grown cold - to all its passions and games. When we see through its tricks - we can watch them from the outside of the illusion.

Watching from the outside of the illusion is "that which is above the mind".