R.I.P. Stan Lee
I'd say, his original run on The Amazing Spider-Man, the first 100 issues with Steve Ditko and John Romita Sr. plus his first appearance in Amazing Fantasy #15, was his best work. Either that, or the first 100 issues of the Fantastic Four he did with Jack Kirby. It's amazing how much of the comics and film industries today owe to those classic runs he wrote and the classic characters that he co-created, he will truly be remembered forever because of the Marvel Universe that he helped mastermind.