Cassatt was born in Allegheny City, Pennsylvania, which is now part of Pittsburgh.She was born into an upper-middle-class family: her father, Robert Simpson Cassat (later Cassatt), was a successful stockbroker and land speculator, and her mother, Katherine Kelso Johnston, came from a banking family. Katherine Cassatt, educated and very well read, had a profound influence on her daughter. To that effect, Cassatt's lifelong friend Louisine Havemeyer wrote in her memoirs: "Anyone who had the privilege of knowing Mary Cassatt's mother would know at once that it was from her and her alone that [Mary] inherited her ability." The ancestral name had been Cossart. Cassatt was a distant cousin of artist Robert Henri. Cassatt was one of seven children, of which two died in infancy. Her family moved eastward, first to Lancaster, Pennsylvania, then to the Philadelphia area, where she began schooling at age 6.
