Jean Piaget
Developmental psychologist who studied children’s cognition
Lev Vygotsky
Russian psychologist who emphasized how the child’s mind grows through interaction with the social environment, rather than the physical environment as Piaget believed
Harry and Margaret Harlow
Performed an experiment on monkeys, which revealed that early attachment was gained by touch more than by nourishment
Konrad Lorenz
Researched imprinting
Mary Ainsworth
Designed the strange situation experiment
Lawrence Kohlberg
Formulated Kohlberg’s levels of moral thinking (preconventional morality, conventional morality, and postconventional morality)