John Curtis Gowan

No question posed, but this forum seemed the best place to mention this developmental psychologist for those who might be interested in the same topics he was.

https://en.wikipedia.org/wiki/John_Curtis_Gowan

I first heard of him during my last year of college, when I found "Operations of Increasing Order" (1980) in the college library, a collection of essays on the development of psychic and other "unusual" abilities, which follows on from his books on the development of gifted, creative, and psychedelic individuals.

Unfortunately it seems his books never made it to ebook or online form (unless I am mistaken), but physical copies can still be found at libraries or the usual used-book vendors.