This story is available exclusively to Insider subscribers. Become an Insider and start reading now. Google's artificial-intelligence chief, Jeffrey Dean, has canceled an all-hands celebration that was set to take place this week, saying it is not an "appropriate" time to hold the event after the ousting of a prominent AI ethics researcher. In a memo sent to employees in Google's research department on Friday, Dean said the events around Gebru's termination "have surfaced large, important issues." "Researchers might hesitate to pursue crucial work on bias in AI and related issues, and have raised concerns about our org culture and ability to pursue this research," Dean wrote. "This deeply saddens me."