here is an interesting interview with the man itself. - YouTube Curiously tho, Jeff speaks some really surprising stuff about 343 management of his voice in general and how they even planed to fired the actress that plays cortana.
On a side note, I’m one of those people to realize that jeffs voice has been changed for the bad, it would be nice to see the old ones returned.
Any way, if you guys love his voice you should definitely listen to this interview.