cortana who is doctor catherine halsey.
Is she the Master Chief's Mother? Well, given what happened to the Master Chief, she may as well be his mother! Within the Halo universe, Dr. Catherine Elizabeth Halsey is a civilian scientist in the United Nations Space Command. She appears in the novels Halo: The Fall of Reach, Halo: First Strike, and Halo: Ghosts of Onyx. In the novels' fiction, a flash clone of her brain tissue is the basis for the construction of the Artificial Intelligence Cortana.