Tong, who served as CIO from 2016 to 2021, will lead an agency with oversight of human resources, pensions and IT.
Gov. Gavin Newsom appointed Tong, who's been the state CIO since 2016, to lead the California Office of Digital Innovation.
Michael Wilkening, an adviser to Gov. Gavin Newsom and former head of the state's Health and Human Services agency, has left state government after 25 years.