William James is widely credited as the progenitor of modern American psychology, and his "Principals" [0] one of the first widely disseminated textbooks on the subject of mental health. He had his own demons, and sought to share his experiences overcoming. I've just recently picked it up and hope to read it soon, as I've been told that it's still a book that reads quite well.

[0] https://en.wikipedia.org/wiki/The_Principles_of_Psychology