He was one of the «olympic level meditators» which where investigated in this paper which was published in PNAS in 2004: https://www.pnas.org/doi/full/10.1073/pnas.0407401101 In the following video, the PNAS paper from 2004 is reviewed by Altered Traits co-author Daniel Goleman: Goleman called these mediators “olympic level meditators” with “extraordinary brain waves”. One of the videos with …