Gregory Hancock Hemingway (November 12, 1931 – October 1, 2001), also known as Gigi, Gig, and Gloria Hemingway, was the third and youngest child of author Ernest Hemingway, and second son of Pauline Pfeiffer. He became a physician and authored a memoir of life with his father. Most of his life was marked by struggles with addiction (which eventually cost him his medical license), estrangement from his father, and uncertainty about his own gender identity.