John has posted his farewell over on his blog.

John’s been managing me now for 6.5 years. I’ve had other friends/mentors/managers before, but it was under John that I became a manager myself.

Everything I’ve learned about people-first, no-nonsense management has come from him. Everything I’ve learned about cross-group co-ordination and asking the right questions has come from him. Everything I’ve learned about Irish whiskey has come from him.

On the technical- and pure getting-shit-done-side, the Google Tech Talk he gave on “Release Engineering as a Force Multiplier” is probably the only resume he’ll ever need, even if he doesn’t actually need it.

Where does John’s departure leave Mozilla, and more specifically, our release engineering team, and even more specifically, me?

I don’t know, but I’m optimistic, mostly because of the imprint left by John on all of us.

http://coop.deadsquid.com/2013/12/on-john-leaving-mozilla/