"For example, all Stan [Lee] has to do with the pros like Jack "King" Kirby, dazzling Don Heck, and darlin' Dick Ayers is give them the germ of an idea and they make up all the details as they go along, drawing and plotting out the story. Then, our leader simply takes the finished drawings and adds all the dialogue and captions! Sounds complicated? Maybe it is, but it's another reason why no one else can bring you that old Marvel magic!"
From Fantastic Four, Vol. 1, No. 48