My own approach to psychotherapy, developed over three decades of clinical practice, can best be described as
existential depth psychology: a (for some, unlikely) fusion of existential psychology (especially that of my former mentor, existential psychoanalyst Rollo May) and the psychodynamic depth psychology (
Tiefenpsychologie) of Freud, Jung, Adler, Rank, et al. While I would consider myself theoretically and practically more a Jungian than Freudian psychologist,

Freud's writings influenced me profoundly from a very young age. As a somewhat intellectually precocious child, I started reading Freud
It was Sigmund Freud's fascinating, flowing, lucid and penetrating prose that inspired me to later pursue a career as a psychotherapist, following brief flirtations with medicine, art, acupuncture, and more enduringly, music in my teens.
Sigmund Freud's "psychoanalysis" is the seminal fount from which all modern psychotherapy more or less springs.