Acknowledgements
I would first like to acknowledge the mentorship of Dr. Ralph W. Hood, for his encouragement and invaluable guidance. Additionally, I would like to acknowledge the contributions of my reviewers Drs. Paul Marshall and Felix Scholkmann for their kind feedback and suggestions which much improved the quality of scholarship of the text. I would also like to acknowledge the institutional support in participant recruitment for the MLE studies summarized here, including IMERE, IANDS, NDERF, the DOPS, the Psychedelic Society, and others, as well as all the participants. Lastly, I would like to thank God and my family, whose unwavering love and support is my greatest blessing in this life.