Opher Lieber is a highly experienced professional in the field of computer science with a strong background in artificial intelligence and firmware development. As a Member of Technical Staff at Thinking Machines Lab since August 2025, Opher contributes to advanced technical projects. Prior to this role, Opher served as Principal Engineer at AI21 Labs, leading LLM training from March 2020 to August 2025. Opher’s extensive career includes positions as Tech Lead and Algorithm Developer, highlighting expertise in large language models. Opher has also made significant contributions as Sr. Technologist and Chief Embedded Firmware Architect at Western Digital, previously SanDisk, and as an independent researcher focusing on scalable reinforcement learning projects. Opher holds both a Master’s and Bachelor’s degree in Computer Science from Tel Aviv University.
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