Thelizabeth "Theo" Boyd was born and raised on a farm in Whitney, Texas, named after her grandmothers Thelma and Elizabeth. Known as "Theo" since middle school, she began writing poems with her father and learning resilience from her mother. She pursued higher education later in life, becoming a high school English and Creative Writing teacher-earning "Rookie Teacher of the Year" her first year-and contributing as a newspaper columnist.

In 2019, Theo experienced a traumatic loss that inspired her debut memoir, My Grief Is Not Like Yours, and launched her podcast, Think Theo, where she explores the complexities of grief. Since the book's release in May 2023, Theo has been featured on numerous media outlets, including Newsweek, The Sun, and The Daily Mail, and has received 17 national and international book awards, including the Indie Excellence Award, two Global Book Awards and the 2025 Rising Lone Star Author Award.

When not writing or speaking, Theo enjoys farm life with her dog, Manly, as they build their new home. She is passionate about helping others navigate grief, using both personal stories and national research to offer hope and healing, and has recently become a Certified Grief Educator.