Yoky Matsuoka.

Yoky Matsuoka is back at Google.

The robotics and AI guru was just re-hired at Alphabet, Google’s parent company, to be the new CTO at its Nest Labs smart home division, Bloomberg reported Monday.

Matsuoka previously taught robotics at the University of Washington and Carnegie Mellon, a job she left to join Google for the first time in in 2009. After helping start Google X, the search giant’s R&D arm, she joined Nest, where Matsuoka helped build the learning software behind the company’s smart thermostat.

She rejoined Google for a short time in 2014 when the company bought Nest, but left to launch a startup called Quanttus the next year. She joined Apple this past May, but left near the end of 2016 after spending less than a year there overseeing health initiatives like HealthKit and ResearchKit.

Besides her work on robotic hands, Matsuoka won a MacArthur Foundation genius grant for her part in helping stroke victims use limbs.

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