Eduardo Telles is a no gi black belt world champion and one of the greatest innovators of the turtle guard. Here's an opening video of Telles who shares some transitions to the turtle guard from his series at the BJJ Library.
Telles is the man 39 and still mixing it up with the youngsters osss 
Telles chill guy
For later
I have this series . . . it's excellent, and includes a lot of stuff you don't really see elsewhere.
Everything I've seen from bjjlibrary looks awesome. How does it work? Do you get instant access if you are a paying member? Or you pay extra for the special guests?
VTFU, thanks! Love me some Telles!