According to Jon Morosi, the Angels have interviewed at least seven candidates for their GM vacancy, and are clearly making progress.
<blockquote class="twitter-tweet" lang="en"><p lang="en" dir="ltr">Can confirm <a href="https://twitter.com/hashtag/Angels?src=hash">#Angels</a> have interviewed Billy Eppler, Tony LaCava, Ross Atkins, Mike Hazen, Hal Morris, Matt Klentak, Scott Servais for GM job.</p>— Jon Morosi (@jonmorosi) <a href="https://twitter.com/jonmorosi/status/644175798124048384">September 16, 2015</a></blockquote>
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At the outset of the 2015 season, it didn't appear as if the Angels would need to be on the hunt for a new GM, but due to the very public dustup between Jerry Dipoto and Mike Scioscia, they were left without a longterm leader. They installed Bill Stoneman in the immediate aftermath, but were clear from the start that he was hired strictly in an interim capacity.
As of now, it appears that Billy Eppler, the Yankees AGM, is the front runner, despite the fact that Scott Servais and Matt Klentak are both AGM's with the Angels. As for the remaining candidates, Tony LaCava is the Blue Jays AGM; Ross Atkins is the Indians VP of player personnel; Mike Hazen is the Red Sox AGM; and Hal Morris is the Angels pro scouting director.
There are many other potential candidates, which Chris Cotillo has organized into a single list. There doesn't seem to be a timetable for when the Angels will make a decision, but it would logically make sense for their new GM to be hired before the offseason begins.