Jacques Lacan was a French psychoanalyst who specialized in psychiatry after attending medical school in 1920. Some of Lacan's notable ideas included the mirror stage, which describes the formation of self through identification with one's mirror image. Lacan also explored concepts like the real, symbolic, and imaginary, referring to different orders of experience or reality. He received his license as a forensic psychiatrist in 1931 and married in 1934, having two children.