Marius Hobbhahn (@MariusHobbhahn) — Twitter Score 17 out of 1000

Marius Hobbhahn is an AI safety researcher who co-founded Apollo Research, an organization focused on detecting and mitigating scheming in frontier AI systems. Marius Hobbhahn's Twitter Score is 17 out of 1000 as of September 2026, ranking #57,091 among 487,142 tracked accounts.

Marius Hobbhahn co-founded Apollo Research after previously working at Epoch AI, which he also co-founded. Apollo Research develops tools and evaluations intended to make powerful AI deployments safer, with a particular emphasis on understanding and controlling deceptive behavior in advanced AI models. Prior to founding Apollo Research, Marius Hobbhahn completed a machine learning PhD under Philipp Hennig and contributed to AI forecasting research at Epoch AI.

Marius Hobbhahn was named to TIME's 2025 TIME100 AI list. According to TIME, Apollo Research works with OpenAI, Anthropic, and the United Kingdom's AI Security Institute to detect and mitigate deceptive AI behavior. Marius Hobbhahn has authored 1,270 posts on the platform and has been mentioned by 8 accounts, with 13 total mentions.

Who follows Marius Hobbhahn on X?

The accounts that follow Marius Hobbhahn include 57 founders, 13 angel investors, 21 influencers and 1 VCs, among them Marc Andreessen, Murad, Kevin Rose, Roon, Dystopiabreaker and Robert Scoble.