Mary Anne Spier is the secretary of the Baby-Sitter's Club, due to her exceptional organization skills and neat handwriting. She is thirteen years old and is in the eighth grade at Stoneybrook Middle School. Mary Anne is very sensitive and cries at the drop of a pin. She cries at the cute kittens in cat commercials, goodbyes, and when others are upset, unhappy, or crying.
Mary Anne's mother, Alma Spier, died when Mary Anne was a baby. She doesn't remember her at all and only has her mother's old things and some pictures.She loves her father, Richard Spier, but he is very strict. He picked out her clothes for her, she was not allowed to wear her hair down, and she couldn't talk on the telephone at night.