Ok, we'll change to that from https://angel.co/today/stories/reddit-names-y-combinator-ceo.... Normally we don't move in the direction of corporate press releases, but in this case the original article has so little information that we might as well.
Also, the other article's title ("Reddit names Y Combinator CEO Michael Seibel as Alexis Ohanian's replacement") seemed to be leading to all manner of misunderstandings in the comments, such as Michael becoming Reddit's CEO, or Reddit taking over HN.