[3] Staff at founding included Charlie Jane Anders, Geoff Manaugh (BLDGBLOG), Graeme McMillan (Newsarama), Kevin Kelly (Joystiq, Cinematical) and feminist retro-futuristic writer Lynn Peril (author of Pink Think: Becoming a Woman in Many Uneasy Lessons).

[5] After a nearly eight-year run, Newitz retired from both io9 and Gizmodo on November 30, 2015, explaining that they had grown to disliking managing both sites at once and having taken them away from their passion of writing articles.

[8][9] On 26 April 2016, Charlie Jane Anders left the site to focus her attention on her then untitled second novel and Rob Bricken took over as editor.

[10] On July 31, 2018, Rob Bricken stepped down as editor of io9, saying that managing the site was taking up too much time and he would rather spend writing articles for it.

[13][14] Following the departure of Pantozzi, who left the site entirely in December 2021,[15] James Whitbrook, who had been an io9 staff writer since 2014, was made the new Deputy Editor in charge of io9.