From Wikipedia:

Kazimierz Dąbrowski (September 1, 1902 in Klarów – November 26, 1980 in Warsaw) was a Polish psychologist, psychiatrist, and physician.

Dąbrowski developed the theory of Positive Disintegration,[1] which describes how a person’s development grows as a result of accumulated experiences. “Disintegration” refers to the maturing of thoughts, and it is positive when the process moves one’s personality to a more developed level.

Dąbrowski had a lifelong dedication to the field of psychology. He established a rehabilitation center in Zagorze (near Warsaw) for patients who suffered mental disorders after experiencing difficult life situations. Lifelong research at this facility supplied him with information that helped shape his concepts.