Olive Gwendoline Potter studied medicine at The London Hospital Medical College just after World War I.
She was among the first women students admitted to the medical school because of the shortage of male doctors caused by the war. She went on to practice general medicine in Surrey, and also to become one of the best and most prolific writers of the girls' school story under the pen name of Josephine Elder. Her best-known work was Evelyn Finds Herself (1929). In addition to her children's books, Josephine Elder also wrote six novels for adults.