Well done, Zakalwe!
IQ1: Were you the lead singer of The Guess Who?
IQ2: After you left the Miles Davis Quintet, did your playing take giant steps forward?
IQ3: Did you play keyboards on Bitches Brew?
IQs:
- Were you the leading painter of the Barbizon school?
- Were you the leader of the Realist movement in art?
- Are you the “father of modern linguistics”?
IQ1) I am not Carl Dixon.
IQ2) I am not Coltrane.
IQ3) DQ.
IQ1) DQ.
IQ2) DQ.
IQ3) I am not Noam Chomsky.
DQ1) I am not female.
DQ2) I am not fictional.
DQ3) I am American.
DQ4) C is not the initial letter of my last name.
DQ5) I am not alive.
ETA: Pending DQs: Draelin, Le Ministre de l’au-delà, Prof. Pepperwinkle(2)
Way to go, Zakalwe!
IQs:
Did the production crew have to dig up the studio floor when filming a movie about you?
Were you narrowly defeated for the Presidency when the votes of California came in?
Were you revealed to be the merry prankster of your particular organization, much to everyone’s surprise?
If I may be so bold as to suggest, it’s easier to think of DQ answers when expressed in the affirmative, so would it be accurate to say that this person is…?:
- male
- real
- American
- First name starts with C
- dead
Recasting number 4 like that loses information - all of my first three guesses were invalidated by the original number 4, but not by the recast one.
The leading Barbizon painter is Jean-Baptiste Camille Corot, while Gustave Courbet lead the Realist movement. Correct, of course, on Chomsky.
DQs:
- Died after 1900?
- Were you in the Arts (as we usually define them here)?
IQ1) I am not Charles Foster Kane.
IQ2) DQ.
IQ3) DQ, but I’m fascinated to see the answer.
Above and beyond the issue mentioned by fanganga, I am simply answering the question as asked.
DQ1) I am not female.
DQ2) I am not fictional.
DQ3) I am American.
DQ4) C is not the initial letter of my last name.
DQ5) I am not alive.
DQ6) I did not die after 1900.
DQ7) I was not in the Arts (as usually defined)
Pending DQs: Draelin, Le Ministre de l’au-delà, Elendil’s Heir(2)
DQ: Are you a political or military figure?
DQ1) I am not female.
DQ2) I am not fictional.
DQ3) I am American.
DQ4) C is not the initial letter of my last name.
DQ5) I am not alive.
DQ6) I did not die after 1900.
DQ7) I was not in the Arts (as usually defined)
DQ8) I am not a political or military figure.
Pending DQs: Le Ministre de l’au-delà, Elendil’s Heir(2)
IQs:
- Were you an inventor of things that already existed, with a lab assistant named Leonardo?
- Were you the first superhero to be called a mutant in the pages of your own comic book?
- Did your best friend occasionally call you “lard hips”?
IQ1) DQ.
IQ2) I am not Charles Xavier (or take a DQ).
IQ3) I am not Bing Crosby.
DQ1) I am not female.
DQ2) I am not fictional.
DQ3) I am American.
DQ4) C is not the initial letter of my last name.
DQ5) I am not alive.
DQ6) I did not die after 1900.
DQ7) I was not in the Arts (as usually defined)
DQ8) I am not a political or military figure.
Pending DQs: Le Ministre de l’au-delà, Elendil’s Heir(2), Prof. Pepperwinkle
Clyde Crashcup from the Alvin Show in the 1960’s is the inventor. The first mutant superhero was DC’s Captain Comet.
DQ: In science or technology?
Okay, so you’ve still got a DQ left…
DQ1) I am not female.
DQ2) I am not fictional.
DQ3) I am American.
DQ4) C is not the initial letter of my last name.
DQ5) I am not alive.
DQ6) I did not die after 1900.
DQ7) I was not in the Arts (as usually defined)
DQ8) I am not a political or military figure.
DQ9) I was not in science or technology.
Pending DQs: Le Ministre de l’au-delà, Elendil’s Heir(2), Prof. Pepperwinkle
DQ: In business?
DQ1) I am not female.
DQ2) I am not fictional.
DQ3) I am American.
DQ4) C is not the initial letter of my last name.
DQ5) I am not alive.
DQ6) I did not die after 1900.
DQ7) I was not in the Arts (as usually defined).
DQ8) I am not a political or military figure.
DQ9) I was not in science or technology.
DQ10) I was in business.
Pending DQs: Le Ministre de l’au-delà, Elendil’s Heir(2)
IQ: Are you a railroad tycoon with several descendants that shared your name?
IQ) I am not Erastus Corning.
I don’t even know who that is. It’s definitely not who I meant, but a quick wiki shows it fits the description provided.
IQ: Are you a railroad tycoon with several descendants and a university that shared your name? 
Yes! I am:
Cornelius Vanderbilt!
Great job with the quick follow up! For what it’s worth, Corning is the guy who founded the railroad that Vanderbilt built into an empire so they are closely tied (and why I knew who Erastus was). It also factored into the decision to pick Vanderbilt, since a lot of the qualifiers could equally apply to Corning - it gave me an out.
It’s all yours!
And well done again, Draelin!