Cabot (CBT) to Divest Purification Solutions Unit for $111M

Jack Dorsey was Twitter’s first CEO — and also its fourth.He led the platform from its launch in 2006 until he passed the torch to co-founder Ev Williams two years later. In 2015, Dorsey returned to the role after Dick Costolo’s stint, even though he was simultaneously serving as CEO of fintech platform Square.Like many, I wondered how one person could adequately handle that level of responsibilit