In an interview of Julie Ann Horvath by a Valleywag reporter: "@Holman is my ex-partner. He was complicit in the actions of both Tom and Theresa Preston-Werner and even admitted to plotting with Theresa Preston-Werner to get women at the company fired. He should be let go from GitHub and I regret being kind to him in previous interviews." [1]
(By the way, I don't have an informed perspective on this - I just remember the source. Holman says elsewhere in this thread "It didn't have anything to do with my departure, nor is it my story to tell.")
[1] http://valleywag.gawker.com/ims-and-email-support-allegation...