Rollo is the pseudonym of the German-American psychologist, May E. Romm, who was born in 1883 and died in 1973. She was a pioneer in the field of psychology, and her work focused on the development of children's personalities. She is best known for her book, 'The Psychology of Childhood and Adolescence, ' which was published in 1924. She also wrote several other books on the subject of child psychology.