George Perez is a very fine comic book artist best known for "team" comics like Teen Titans and The Avengers and any other popular comic that would cause another artist to say, "No, no! I won't draw that book with that many characters in it!" He is also an extremely nice man about whom I have never heard a bad word.
He has not been well for some time. His vision is failing and he is no longer drawing. Worse, it has just been announced that he is suffering from Stage 3 Pancreatic Cancer. More details are available on his new Facebook page. Great guy. Great talent. Very sad news.