Mark Certo

Mark was a sound engineer at the Monroe Institute. He is an expert in binaural beats, brainwave correlates to various states of consciousness, and the different aspects/entities of the self. His website is the https://thetriadmind.com and his old podcast is archived at https://thetriadmind.com/podcast/expanding-on-consciousness-podcast/

He has two interesting podcasts with https://supernaturalcircumstances.com/  

They don't go quite as deep as they could and wrap up right when they get to some of the best stuff unfortunately. A more in depth conversation about the science of using various frequencies for meditation and self exploration would be amazing.