The 4/1 profile (Opportunist / Investigator) is one of the twelve profiles of Human Design, a modern esoteric system originated in 1987 by Ra Uru Hu and presented here as a contemporary framework rather than ancient wisdom. A profile is formed from two of the six lines, a scheme the system borrows from the six lines of an I Ching hexagram and reads psychologically: the profile pairs a conscious line with an unconscious one to give an archetypal role. The 4/1 profile joins the roles named Opportunist / Investigator. The line names and their meanings are Human Design's own twentieth-century reading, not a claim inherited from the Chinese classic whose six-line figures suggested the structure; they are described here as the system presents them, not as verified fact.
Human Design describes the fourth line, Opportunist or Networker, as needing an external foundation of fixed friendships through which opportunity arrives; the first line, Investigator, is described as needing an internal foundation instead, built through personal study before it feels safe to act. The 4/1 profile pairs a conscious network dependent line with an unconscious research driven one, and it is one of two profiles in the twelve, along with 1/4, that combine exactly these two lines; the system's own teaching distinguishes them chiefly by which line is conscious and which unconscious, the 4/1 leading with sociability and grounding it, beneath the surface, in private research.