For an excellent, in-depth look at how psilocybin-assisted therapy works, please have a look at this psilocybin trial led by Dr. Robin Carhartt-Harris at the Imperial College of London
Clinical psychologist Dr. Rosalind Watts discusses how magic mushrooms can beat depression, at the Imperial College of London.
Here’s Dr. Roland Griffiths, Director of the Johns Hopkins Center for Psychedelic and Consciousness Research, discussing how psychedelics can relieve suffering, especially for those dealing with terminal illness.
Again from the Johns Hopkins Center for Psychedelic and Consciousness Research, Dr. Matthew Johnson gives a lecture on the therapeutic effects of psilocybin.
Michael Pollan's book "How To Change Your Mind" looks at the highly controversial terrain of the renaissance of both the science and popular usage of psychedelic substances.