
Viktor Emil Frankl was an Austrian neurologist, psychiatrist, philosopher, and Holocaust survivor, who founded logotherapy, a school of psychotherapy that describes a search for a life's meaning as the central human motivational force. Logotherapy is part of existential and humanistic psychology theories.
Excerpt from Wikipedia, available under CC BY-SA 4.0.

Man's search for meaning
1984
ISBN 9780671244224
El hombre en busca de sentido
2013
ISBN 9788425423314
Man's search for meaning; an introduction to logotherapy
1971
ISBN 9780671481162