who wrote the epilogue to the invisible man and why?

That would be the narrator. The narrator tells us how he had seen Mr. Norton on the subway recently and asked him if he remembered him. The old man did not understand why the narrator said he should be ashamed for not recalling his destiny. Norton escaped onto another train, leaving the narrator laughing and depressed. He muses on his purpose in writing this all down and explains that he has learned some things. He has been hurt horribly but refuses to lose life so approaches it with hate and love. He hopes he has become a little bit as human as his grandfather. He has beaten everything except his mind and resolves to end his hibernation and accept his social role. He wonders if on some level, in his invisibility, he speaks for us all.