Final answer:
The researcher who developed the Dimensions of Personality in 1947 is Hans Eysenck, who along with Sybil Eysenck believed in two main personality traits: extroversion/introversion and neuroticism/stability.
Step-by-step explanation:
The researcher who developed the Dimensions of Personality in 1947 and posited two main personality traits, extroversion/introversion and neuroticism/stability, viewed on a continuum, is Hans Eysenck.
Hans Eysenck, along with his colleague Sybil Eysenck, believed that personality is largely governed by biology and each person can be understood through these two specific personality dimensions.
This perspective was part of a broader debate among personality theorists, including trait theorists like Raymond Cattell who identified 16 personality factors, and the proponents of the Five Factor Model or the Big Five personality factors, which include openness to experience, conscientiousness, extroversion, agreeableness, and neuroticism.