Jim Lee is a very popular comic book writer and artist. He did some amazing art for Marvel's X-Men in the late '80s and early '90s. I loved the X-Men comics that he worked on. He then co-founded Image Comics where he did some really cool stuff such as WildC.A.T.s and Gen 13 under his Wildstorm Productions studio. Gen 13 was one of my favorites. He was most recently involved with rebranding all DC Comics superheroes in The New 52. Lee's designs are now the guide for most of DC's most popular characters, and he's also serving as co-publisher of the company.
Whats funny about all this is that Marvel and DC both rejected Lee several times before they finally gave him a shot. Lee has shared some of these rejection letters online, and I've posted them here to read. What's so great about this is that Lee never gave up. He just kept sending them stuff until they finally gave him something to work on. It goes to show that if you want something bad enough, keep working at it and don't give up.
The next letter was the first assignment that he got from Marvel.
This was the result of his first job.
Via: Marvel Age of Comics