Heh, I was gunning for Lee Harvey Oswald, didn’t expect Oliver Stone 
And the other two were Norman Osborn (a.k.a. Green Goblin) and Daniel “Oz” Osbourne of Buffy fame.
DQs :
Are you an artist ?
Are you American ?
IQs :
Are you a one-eyed ornery old bastard who keeps a pair of crows as pets ?
Do you watch the ships roll in, then watch them roll away again ?
Did you save the lives of many Jews during WW2 ?
Have you become Death, destroyer of Worlds?
Sorry about the delay – I lost my Internet connection Friday afternoon and couldn’t get on line again until yesterday, when I had to catch up on what I had let accumulate during the weekend.
Anyway…
Worm: I did not get my fame from politics, though I was tangentially involved in that field.
I’m not Odin.
Johnny Q: I’m neither Laurence Olivier (who gave the advice to Dustin Hoffman, as I recall) nor J. Robert Oppenheimer.
Kobal2: I’m not an artist, but I am American.
I’m still not Odin (Question #1). I’m also neither Otis Redding (#2) nor Oskar Schindler (#3).
SUMMARY:
Real American person born in nineteenth century
Not alive
Not female
Not an artist
Not famous for politics, but tangentially involved (more than a mere voter)
So we’re back on track 
Lemme see…
Were you a Seminole leader?
Are you a Japanese who has won a literature prize in Stockholm?
Did you win a fancy prize you get in Oslo?
I’m not Osceola.
I’m not Kenzaburo Oe.
And I’m not Lord Boyd Orr.
Are you the jurist who talked about yelling fire in a crowded theater?
Did you oversee the peaceful split of two countries?
I’m not Oliver Wendell Holmes, Jr.
Worm: I’m about to oversee your asking of a DQ.
So you’re not Oscar II of Sweden, who in 1805 saw Norway split peacefully from Sweden.
DQ: Are you an industrialist?
Yes.
SUMMARY:
Real American industrialist born in nineteenth century
Not alive
Not female
Not an artist
Not famous for politics, but tangentially involved (more than a mere voter)
Are you Al Capone’s Irish competitor?
Are you a surreal Irish humorist and civil servant?
I’m not Myles O’Donnell (Question #1). As for the humorist, I doubt you mean Oscar Wilde, so take a DQ after identifying whom you had in mind.
Are you the wealthiest man in a very big country?
You’re not Dion O’Banion or Flann O’Brien.
DQ1: Is your business entirely legal?
DQ2: Are you of Irish descent?
IQ: Are you a self deprecating piano player?
Just because I didn’t answer with the Irish gangster you had in mind doesn’t mean I was wrong. Al Capone’s competitors did include Myles O’Donnell. So I’ll answer one DQ by saying that I was truly a legitimate businessman, although I did face legal action at least once in my life.
And since I don’t know the self-deprecating piano player, I’ll add that I am not of Irish descent as far as I can recall. Hey, you forget stuff when you’re alive – why would that change once you’re dead? 
Worm: I’m not Oleg Deripaska, who is (by many accounts) Russia’s richest man.
I was going for Oscar Levant, but I may not have been accurate in my description.
DQ: Were you based in Chicago?
IQ: Did you and your brother reach new heights?
IQ: Are you a popcorn magnate?
I was not based in Chicago.
I am neither Orville Wright nor Orville Redenbacher.
SUMMARY:
Real American industrialist born in nineteenth century
Not alive
Not female
Not an artist
Not famous for politics, but tangentially involved (more than a mere voter)
Legitimate businessman
Not of obvious Irish descent
Did you experience many ups and downs with your most famous invention?
I am not Elisha Otis.