Man arrested after Mint Butterfield, Slack co-founder’s child, is safely located in S.F. San Francisco ChronicleMissing teen of Slack co-founder, found in van with man, 26, now facing kidnapping charges New York Post 16-Year-Old Child of Billionaire Slack Co-Founder Found Alive After Going Missing PEOPLEBillionaires Child Missing From Marin County: Police PatchSlack co-founder, former CEO’s child reunited with family after running away KTVU FOX 2 San Francisco