From making history at Harvard’s prestigious Hasty Pudding Theatricals to commanding the screen in Amazon Prime’s blockbuster series “Fallout,” Annabel O’Hagan exemplifies the new generation of versatile American actresses. Born in Virginia in 1997, this 28-year-old performer has swiftly ascended from theatrical stages to becoming a recognizable face in major television productions. Her portrayal of the complex Stephanie Harper in the critically acclaimed “Fallout” series has positioned her as one of Hollywood’s promising emerging talents to watch in 2026.
Who is Annabel O’Hagan
Annabel O’Hagan is an American actress born on May 7, 1997, in Virginia, United States. She gained widespread recognition for her role as Stephanie “Steph” Harper in Amazon Prime Video’s hit series “Fallout” (2024-2026), based on the popular video game franchise. O’Hagan made history in 2018 as one of the first six women to be cast in Harvard University’s Hasty Pudding Theatricals in its 170-year history.
Annabel O’Hagan Biography / Wiki
| Field | Details |
| Full Name | Annabel O’Hagan |
| Date of Birth | May 7, 1997 |
| Age | 28 years (as of January 2026) |
| Birthplace | Virginia, United States |
| Hometown | Richmond, Virginia |
| Nationality | American |
| Profession | Actress |
| Years Active | 2020–present |
| Education | Harvard University – BA in Psychology and Theater |
| Notable Role | Stephanie Harper in Fallout (2024-2026) |
| @annabelohagan |
Annabel O’Hagan Education
Annabel O’Hagan graduated from Harvard University with a Bachelor of Arts degree in Psychology and Theater. During her time at Harvard, she was extensively involved in the Harvard-Radcliffe Dramatic Club (HRDC), participating in ten productions by the time of her graduation in 2019. Her theatrical work at Harvard included both musicals and straight plays, with notable performances in “Nine: The Musical,” “Chicago” (where she played a lead role), and “Romeo and Juliet” (in which she portrayed the Nurse).
Early Life
Annabel O’Hagan was born on May 7, 1997, in Virginia, United States, with Richmond being her hometown. Specific details about her parents and early family life have not been publicly disclosed. She grew up with a passion for theater, participating extensively in musical theater during her high school years.
Before attending Harvard, O’Hagan developed her theatrical skills through high school productions, notably playing Roxie in “Chicago,” which she cites as one of the shows that sparked her interest in musical theater. Her early experiences in performing arts laid the foundation for her later academic and professional pursuits in theater and acting.
Annabel O’Hagan Profession
Annabel O’Hagan is a professional actress specializing in television and film productions. She works across multiple genres including drama, science fiction, and independent cinema. Her versatility allows her to portray complex characters ranging from dramatic television roles to supporting parts in major motion pictures.
O’Hagan’s background combines formal theatrical training with on-screen performance, having honed her craft through extensive stage work at Harvard before transitioning to professional screen acting. She approaches roles with depth informed by her academic background in psychology and theater.
Annabel O’Hagan Career Journey
Annabel O’Hagan’s professional journey began while she was still a student at Harvard University, where she immersed herself in theatrical productions. During her time at Harvard from 2015 to 2019, she participated in ten HRDC shows, transitioning from musical theater to include straight plays in her repertoire. Her roles ranged from leading parts in “Chicago” to character work in Shakespeare’s “Romeo and Juliet”.
In September 2018, O’Hagan made history when she was selected as one of the first six women to join the cast of Harvard’s Hasty Pudding Theatricals, breaking a 170-year all-male tradition. She was among the twelve students cast for the 2019 Hasty Pudding show, marking a significant milestone in the organization’s history and her own career. This groundbreaking achievement garnered media attention and highlighted her as a trailblazer in collegiate theater.
After graduating from Harvard in 2019, O’Hagan transitioned to professional screen acting. Her screen debut came in 2020 with a guest appearance in the long-running NBC series “Law & Order: Special Victims Unit,” where she played the character Dehlia in one episode. This marked her entry into professional television work.
In 2021, O’Hagan appeared in the Denzel Washington-directed film “A Journal for Jordan,” playing a waitress in a Kentucky diner scene. The same year, she worked on the short film “Half,” portraying the character Kate. In 2022, she continued building her film resume with another short film titled “Knowing Me, Knowing You”.
In 2023, O’Hagan secured a television role in the Apple TV+ drama series “Dear Edward,” appearing as Harper in one episode. This role expanded her visibility in streaming television productions.
Her career breakthrough came in 2024 when she was cast as Stephanie “Steph” Harper in Amazon Prime Video’s highly anticipated “Fallout” television series, based on the popular post-apocalyptic video game franchise. The show premiered in April 2024 to critical acclaim and massive viewership, becoming one of Prime Video’s most successful series.
In “Fallout,” O’Hagan portrays a complex character who initially appears as a pregnant resident of Vault 33, best friend to the protagonist Lucy (played by Ella Purnell). Her character arc includes experiencing tragedy when her husband Bert is killed during a raider attack, seeking revenge by retaliating against the attackers (sustaining a fork injury to her eye in the process), and later becoming overseer of Vault 32. Season 2 reveals her character’s true identity as a pre-war Vault-Tec employee who was cryogenically frozen in Vault 31, adding layers of intrigue to her role.
O’Hagan appeared in seven episodes across the first two seasons of “Fallout” (2024-2026), with her character playing a pivotal role in the series’ complex narrative about vault experiments and corporate conspiracies. Her nuanced performance, balancing vulnerability with calculated deception, has been praised by fans and critics.
In 2024, she also appeared in the independent film “Rent Free,” directed by Fernando Andrés, playing the character Lindsay. The film explores themes of modern millennial struggles with financial stability and personal responsibility in Austin, Texas. She has an upcoming project titled “Into the Sky,” currently in post-production.
Annabel O’Hagan Movies and TV Shows
Television Series:
- Law & Order: Special Victims Unit (2020) – Dehlia
- Dear Edward (2023) – Harper
- Fallout (2024-2026) – Stephanie “Steph” Harper
Films:
- A Journal for Jordan (2021) – Waitress (Kentucky Diner)
- Rent Free (2024) – Lindsay
- Into the Sky (Post-production) – Actress
Short Films:
- Half (2022) – Kate
- Knowing Me, Knowing You (2023)
Annabel O’Hagan Awards
Specific awards won by Annabel O’Hagan have not been publicly documented as of January 2026. However, her achievement as one of the first six women to be cast in Harvard’s Hasty Pudding Theatricals in 2018 represents a significant milestone in breaking gender barriers in collegiate theater. Her work on “Fallout” has contributed to the series’ critical and commercial success, though individual acting awards for her performance have not been reported.
Annabel O’Hagan Controversies
No publicly reported controversies involving Annabel O’Hagan have been documented. She has maintained a professional reputation throughout her academic and professional career. Her groundbreaking participation in Hasty Pudding Theatricals was celebrated as a positive step toward gender inclusivity rather than generating controversy.
Annabel O’Hagan Personal Life
Annabel O’Hagan maintains a relatively private personal life while remaining active on social media through her Instagram account @annabelohagan, where she has accumulated approximately 32,000 followers as of 2024. She uses her platform to share professional updates and behind-the-scenes content from her work on “Fallout” and other projects.
Her pronouns are she/her, as verified on her IMDb profile. O’Hagan’s passion for theater that began in high school has continued throughout her professional career, informing her approach to screen acting. She has spoken about her love for transformative roles, noting her enjoyment in playing characters outside her typical casting type, such as her portrayal of the Nurse in “Romeo and Juliet” at Harvard.
Annabel O’Hagan Height and Physical Appearance
| Physical Attribute | Details |
| Height | 5 feet 8 inches (173 cm) |
| Weight | 126 lbs (57 kg) |
| Hair Color | Blonde |
| Eye Color | Blue |
| Body Type | Slim |
| Ethnicity | Caucasian |