David Greenwalt
David Greenwalt (born October 16, 1949) is an American screenwriter, director, and producer.He was the co-executive producer of the TV series ''Buffy the Vampire Slayer'' and co-creator of its spinoff, ''Angel''. He is also co-creator of the short-lived cult television show ''Profit'', and co-created the NBC supernatural drama ''Grimm''. Provided by Wikipedia
