Bryan O'Sullivan currently serves as the Chief Technology Officer at Voxel since July 2025 and has been the Lead Author for the book Real World Haskell since March 2007. O'Sullivan's notable roles include SVP of Software at Zoox from September 2022 to February 2025, where support was provided to teams developing autonomous robotaxis, and VP of Engineering for AI Software at Meta from March 2020 to September 2022, overseeing teams focused on AI platform and infrastructure. Prior engineering leadership at Facebook spanned from December 2011 to March 2020, including positions as Director of Engineering and earlier roles managing developer efficiency and software engineering teams. O'Sullivan co-founded MailRank in 2010, applying machine learning to enhance business communication. Additionally, O'Sullivan has contributed to academia as a Visiting Lecturer at Stanford University multiple times between 2011 and 2016, focusing on systems software and programming principles. Education was completed at Trinity College Dublin, earning a BA in Computer Science.
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