Southern Hospitality ended at number 86 on the Billboard Hot 100.
Mary Dinsmore Ainsworth -LRB- -LSB- ˈeɪnswɜrθ -RSB- nee Salter ; December 1 , 1913 -- March 21 , 1999 -RRB- was an American-Canadian developmental psychologist known for her work in the development of attachment theory .. American-Canadian. American Canadian. developmental psychologist. Developmental psychology. attachment theory. attachment theory. She designed the strange situation procedure to observe early emotional attachment between a child and its primary caregiver .. strange situation. strange situation. A 2002 Review of General Psychology survey ranked Ainsworth as the 97th most cited psychologist of the 20th century .. Review of General Psychology. Review of General Psychology. Many of Ainsworth 's studies are `` cornerstones '' of modern-day attachment theory .. attachment theory. attachment theory