So: why? Well, we started this company 13.5 years ago (though it’s “only” been 10 years since we started development of Slack itself). He’s going to keep the bar high, and then keep pushing it higher. In his seven years (!) as part of Slack he’s led product development in nearly every area at one point or another, and the ambition of our product strategy owes a lot to his leadership. And, Slack’s own Noah Weiss is the new Chief Product Officer. Their impact will be felt for as long as Slack is around.Ĭal remains the CTO which is good because he’s plainly, no exaggeration, the best CTO in the world. Their individual contributions as leaders were indispensable but they were also team players and helped make us an all-star executive team. They were both more experienced than me and taught me a lot (probably more than I know, even now). Tamar and Jonathan arrived within a month of each other at a critical point in Slack’s development as a company. Planning has been in the works for several months.

(FWIW, this has nothing to do with Bret’s departure. Slack will have a new CEO: Lidiane Jones. Also, both Tamar and Jonathan Prince are leaving. In early January, I’ll be stepping down as CEO of Slack.

Stewart butterfield email