Ari Herbert-Voss

Ari Herbert-Voss is an American computer security researcher and entrepreneur, best known as the CEO and co-founder of RunSybil, an autonomous offensive security platform. She made history as OpenAI's first security hire, where she specialized in breaking machine learning systems. Today she leads RunSybil, which raised $40 million in March 2026, and is a sought-after speaker at major security conferences like DEF CON and Black Hat.

Her work sits at the intersection of adversarial machine learning and cybersecurity, and she is widely respected for her no-nonsense approach to AI security. Herbert-Voss is active on social media under the handle @adversariel, where she shares insights and engages with the security community. She is based in San Francisco, California. [edit]

Herbert-Voss's path to AI security started at the University of Utah, where she studied computer science. She then moved to Harvard University for her PhD, specializing in adversarial machine learning and cybersecurity. During her doctoral studies, she worked as a research co-op at Rapid7, the cybersecurity firm, gaining hands-on experience in offensive security.

Her breakthrough moment came at DEF CON 27 in 2019, where she delivered a talk titled "Don't Red Team AI Like a Chump." The presentation broke down what it really means to attack machine learning systems and became a touchstone in the AI security community. It was this talk that helped establish her as a leading voice and likely caught the attention of OpenAI, setting the stage for her future role there. [edit]

Herbert-Voss joined OpenAI as a research scientist, becoming the organization's first security hire. Her work focused on breaking machine learning systems, a role that placed her at the forefront of AI security. After her tenure at OpenAI, she co-founded RunSybil, an autonomous offensive security platform, with Vlad Ionescu.

In March 2026, RunSybil raised $40 million in a funding round led by Khosla Ventures. The company has quickly gained attention, and Herbert-Voss has become a prominent speaker, appearing at Black Hat Asia 2026 to discuss "The Rise of Agentic Offensive Security." She has also publicly argued that open-source models can find bugs just as well as proprietary systems, challenging industry assumptions. [edit]

Herbert-Voss is seen as a pragmatic and direct voice in AI security. She speaks at major conferences and is known for her straightforward, no-nonsense commentary on breaking AI systems. Her social media presence under @adversariel reflects her technical focus, and she engages with the security community on pressing issues. She is respected for her expertise rather than for any celebrity persona, and fans of AI security follow her for her insights. [edit]

In the world of AI security, Ari Herbert-Voss commands attention not through celebrity antics but through technical gravitas. As of August 2026, iFANN has not yet evaluated her fame; no ranking data has been collected for her. This absence of data is itself telling: her influence is measured in conference keynotes and startup valuations, not in viral metrics. She is not among the world's most famous individuals, nor does she hold a placement in any iFANN fame ranking. Her audience is the security community, professionals who follow her for adversarial machine learning insights, not fanfare. There is no formal fandom name, no organized fanbase, no fan campaigns. Her social media handle, @adversariel, attracts followers interested in breaking AI systems, but these are colleagues and enthusiasts, not a named community. The lack of a documented fandom underscores her position as a respected expert rather than a cultural phenomenon. Her fame, such as it is, derives from professional milestones: being OpenAI's first security hire, founding RunSybil, and delivering a signature DEF CON talk. These achievements are covered by tech press and industry analysts, but they do not translate into mainstream recognition. iFANN's data collection may eventually capture her standing, but for now, she remains a figure of professional, not cultural, significance.[edit]

Her professional handle "adversariel" is a clever play on her name and her focus on adversarial machine learning. She once appeared on The Black Pill Network (TBPN) to talk about dinosaurs, showing a side interest in paleontology. Her DEF CON 27 talk title "Don't Red Team AI Like a Chump" became a signature phrase in AI security circles. She is an alumni affiliate of Harvard's Berkman Klein Center. Her work has been cited in discussions about AI-powered computer worms, highlighting her influence on emerging threat research. One of the most retold stories from her career is the moment she became OpenAI's first security hire, a fact widely cited in coverage of her later startup. Another notable moment was her keynote at Black Hat Asia 2026, where she discussed autonomous cyber threats alongside journalist Violet Blue, a session that drew significant industry attention. These moments, while not legendary in a fan-culture sense, are the touchstones that security professionals recall when her name comes up.[edit]

Details about Herbert-Voss's family are not publicly documented. She keeps her personal life private, and no information about parents, siblings, or household is available. Her professional focus is clearly on her work, and she maintains a low profile regarding family matters. [edit]

Herbert-Voss co-founded RunSybil with Vlad Ionescu, who serves as CTO. Her professional network includes colleagues from OpenAI, Meta, Harvard University, and Rapid7. She is also affiliated with the Berkman Klein Center and the Belfer Center for Science and International Affairs. [edit]

No public information is available about Herbert-Voss's romantic relationships or dating history. She has not discussed personal relationships publicly, and no credible sources have reported on this aspect of her life. As of 2026, her relationship status remains undocumented. [edit]

Herbert-Voss's personal net worth has not been publicly disclosed, but her primary asset is her equity stake in RunSybil. The company raised $40 million in March 2026, led by Khosla Ventures, which suggests a significant valuation. As CEO and co-founder, her stake is likely worth millions, though exact figures are not available. iFANN's editorial analysis currently estimates her net worth at $10 million as of 2026, based on her equity and industry benchmarks for successful startup founders.[edit]