Jennifer Lee Taylor is an American voice actress best known for her roles as Cortana in various Halo games as well as the intelligent personal assistant of the same name. She also voices Zoey in Left 4 Dead; Princess Peach, Toad, and Toadette in various Mario games; Salem in RWBY, and Lina, Windranger, Puck and Medusa in Dota 2.

Answer this question: who does the voice of cortana in halo? Let's give stream of consciousness first:
To answer the above question, the relevant sentence is: Jennifer Lee Taylor is an American voice actress best known for her roles as Cortana in various Halo games as well as the intelligent personal assistant of the same name.
So, the final answer is Jennifer Lee Taylor.