Catherine Halsey (Earth-5875)

"For a long time I had thought that we had to sacrifice a few for the good of the entire human race. I have killed and maimed and caused a great deal of suffering to many people-all in the name of self-preservation. But now I'm not sure that philosophy has worked out too well. I should have been trying to save every single human life... no matter what it cost."

- - Dr. Catherine Halsey

Dr. Catherine Elizabeth Halsey, MD, PhD, is a former scientific adviser for the Office of Naval Intelligence who was the responsible for spearheading the SPARTAN-II Program, as well as the improvement and development of Auton synthetic and the MJOLNIR Powered Assault Armor.

Biography
Born in Port Vernon, Endymion, on March 19th, 2492, Catherine Elizabeth Halsey knew she would become a scientist after her intelligence and dedication to science was brought upon her own parents.

From there onward, Halsey continued to showcase her brillance and defy the educational systems at the time, getting the attention of the Dean of Biological Science at Koletre-Browning University, funding a voyage to Circumstance, where she continued her studies until 2507.