It's likely BF Skinner
An Existential Affair - 2006 is rated/received certificates of: USA:R
He created the method known as psychoanalysis for investigating and treating the mind.
It never was a philosophy and Freud developed his theory of how the mind works he was the father of psychology and analysis.
Psychoanalysis, Clinical Psychology, Counseling Psychology, Child Psychology, Neuro Psychology, Psychiatry.
Emmy Van Deurzen has written: 'Existential perspectives on supervision' -- subject(s): Existential psychotherapy, Supervision, Counseling psychology 'Paradox and passion in psychotherapy' -- subject(s): Existential psychotherapy
Erich Kurt Ledermann has written: 'Natural therapy' -- subject(s): Naturopathy 'Existential neurosis' -- subject(s): Neuroses, Existential psychology
Elisabetta Basso has written: 'Michel Foucault e la daseinsanalyse' -- subject(s): Philosophy, Psychology, Existential psychology
Hugo Munsterberg is the father of industrial psychology
who is the father of physiological/biological psychology
Wilhelm Wundt is known as the Father of Psychology.
Arthur Salles has written: 'O encontro de si mesmo' -- subject(s): Existential psychology, Psychoanalysis
Carl Diem founded world first sport psychology laboratory at Dentsche Sporthochschule in Berlin, Germany. Therefore he is supposed to be the father of Sport Psychology.
Wilhelm Wundt
wilhem wundt
Adler
This link should be helpful, I believe an existential crisis is the same as an existential meltdown/breakdown.