Final answer:
Alfred Adler recognized the importance of a person's position in the family constellation and suggested that birth order influences personality development.
Step-by-step explanation:
The psychologist who recognized the importance of a person's position in the family constellation is Alfred Adler. Adler's theory emphasized the social aspects of a person's development and his concept of the inferiority complex. He proposed that our birth order can significantly shape our personalities, with each position within the family contributing to different personality traits and behaviors. For example, Adler posited that older siblings might become overachievers to compensate for having to share parental attention, whereas youngest children might be spoiled, leaving middle children to minimize the negative dynamics present in the family structure.