Here is the quite exciting press release (part two - read "part one" here) for the two hour season finale of Grey's Anatomy, "Freedom," airing May 22. Thanks to ABC.

On the two-hour season finale of “Grey’s Anatomy,” Meredith and Derek have one last shot at a successful outcome in their clinical trial, as the other surgeons work together to free a boy from a hardening block of cement. Meanwhile, Izzie helps Alex care for an ailing Rebecca, and Lexie discovers critical information about George’s intern status, on “Grey’s Anatomy,” THURSDAY, MAY 22 (9:00-11:00 p.m., ET) on the ABC Television Network.
“Freedom” was written by Shonda Rhimes and directed by Rob Corn.

Shonda Rhimes, obviously, is the creator of Grey's Anatomy. Rob Corn has previously directed many, many episodes - most recently having directed 412 "Where the Wild Things Are."