Some sources think that disagreements between CEO and founder Jack Dorsey are apart of the reason that Keith Rabois is leaving. In a statement Rabois said. “Leading our amazing crew has been the most rewarding professional journey of my life. I am forever grateful to Jack, for his confidence in me and to each and every member of the team for allowing me to learn from them. But every day matters. And it is better at this point for me to be doing something different every day.” Sarah Friar will become acting COO.