I'm pretty self-sufficient in the wilderness, but for me it would be my boys. My oldest, at 23 is already one of the go-to guys on the local SAR team and has been nominated for the leadership program. He is as nuts for the wilderness as I am and we make a formidable team. I have the old school bushman skills and he has serious technical knowledge and is a better mountaineer than I am. His technical knowledge makes him an invaluable resource.
My younger son is a straight-up Paul Bunyan kinda guy, has some serious heart, and is very eager to learn. It doesn't matter what we are doing, he's in there like a dirty shirt. While he is still developing his basic skill set, he's a really good guy to have your back, and is always on me to take him out to the mountains. He is going to be an excellent tracker, scout, and woodsman one day.
Other than that, I have had a few mentors over the years that have humbled me with their knowledge and I would put my life in their hands in a heart beat.
I think though I gotta go with my boys. I know their strengths and tendencies and they respect my experience ( and I theirs), so there isn't much we couldn't get through together.
Other than them, Ray Mears comes to mind