Known for writing and production work on shows such as Brooklyn Nine-Nine, Happy Endings, Splitting Up Together, and Superstore, Ornelas has also written and contributed to This American Life and the New York Times. In 2019 Ornelas signed a multi-year development deal with Universal Television, beginning with the Peacock sitcom Rutherford Falls.
Ornelas is from Tucson, Arizona. She is Navajo, born to the Edge Water clan. Her maternal grandfather is Water Flowing Together clan and her paternal grandfather is Mexican clan.
Ornelas knew as early as second grade that she wanted to write for television. She attended the University of Arizona, where she studied media arts.

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