Botticelli

[Quailman]

Also:

Were you famous for doing impressions of well-known people, and even had your own TV show for a time?

Because the answer is Rich Little

[Scurra]

Did you find out somewhat late in life that you're related to Emperor Zurg? This would be the immortal Buzz Lightyear
_________________
_{still Quiz Olympiad champion. Must get a life.
New definitions: COFFEE - someone who is coughed upon}

[PuzzleScot]

Are you a mathematician that composed an equation that indicates the least energy route is always taken in a dynamic system?

[Quailman]

Are you Hadron's partner?

[Pigboy*]

Are you a comedian born in Ulverston, England? Stan Laurel

[3iff]

[3iff]

Another stumper:

Were you once married to Julia Roberts?

[Zag]

General: Is the style of entertainment with which you're associated a circus? (I am including Cirque du Soleil in my definition of 'circus,' since it's right there in the name and all.)

Edited just to add bold style.

[Quailman]

Good question, Zag. I had already googled Fischbacher and Horn (though I had to use their fist names, Seigfried and Roy). I didn't know their last names but thought maybe...

I have a general coming from Buzz Lightyear, but I'll wait for the answer to yours.

[Zag]

Thanks. When he said that all but one is appropriate for under-16 crowd, it immediately made me think of Cirque du Soleil, which has an X-rated show in Vegas. But a little googling did not turn up anyone who looks like a founder or key person starting with L, but I admit I didn't try that hard. So I tried to include it in a question, but make it a little broader, in case I was close but not quite on the mark.

[ralphmerridew]

For the expired elkhound question, I was thinking of Rob Lowe, but there are probably others.

[Quailman]

And my expired actor in The World According to Garp stumper was John Lithgow, who portrayed a woman.

[Zag]

[ralphmerridew]

@Zag: http://en.wikipedia.org/wiki/Guy_Laliberté

[Lepton]

Update:

Stumpers:
In 2000, did you appear in Little Nicky as the character John?
Are you a mathematician that composed an equation that indicates the least energy route is always taken in a dynamic system? I am not Lenz.
Are you Hadron's partner? Ceci n'est pas Lacuna Lepton?
Were you once married to Julia Roberts?

Generals:
Hitchhiker, DPW (free), Quailman, Jack_Ian, Undercover Monk, rm, MatthewV, jesternl, Jack_Ian, 3iff (2), Zag
I am not female.
I am alive.
I am not a fictional character.
I am known for being in the entertainment industry.
I was born in a NAFTA country, and I currently reside in a NAFTA country.
I am not known for starring in films.
I am not known for significant contributions to music.
I am not known for significant contributions to entertainment technology.
I am not best known for acting.
My form of entertainment is, with one exception, suitable for children under 16.
I am not known primarily as a writer.
I am (decidedly!) not involved in the motion picture industry.
The style of entertainment for which I am best known is of the sit-and-watch variety and thus is not active or interactive.
The style of entertainment with which I am associated is performed in groups.
For the style of entertainment for which I am best known, I am not a performer.
The style of entertainment with which I am associated is performed in front of a live audience.
I am not primarily involved in sports.
The style of entertainment with which I am associated is a circus (with a definition that includes Cirque de Soleil).

Ralphmerridew: Are you the founder of Cirque de Soleil? Yes, I am Guy Laliberte.

Laliberte is a Quebecois Canadian who formed the Cirque de Soleil after a short career as a street performer. He is also known for being the "first clown in space", and has returned from the ISS since the begining of this game. Thanks everyone!

[Quailman]

[PuzzleScot]

...mathematician... Lenz is wrong.

Edit: Oops, didn't notice we were done! Hooray!

LAGRANGE was the answer to that one, btw.
The Lagrangian of a system is Kinetic Energy - Potential Energy. (L=T-V)
I remember using it in applied mathematics to deduce just about any equations of motion. Wiki makes it look really complicated, though maybe I was smarter back then

[PuzzleScot]

blimey - I didn't realise how close to the mark I was with the 'in space' question at the off! Must have given you a shock!!

[Duke Gnome]

[Scurra]

Hey, good work. I hadn't thought of a Circus until Zag's question (I was heading toward Puppets with my questions.)

But I think he qualifies on the "famous" count - at least at the moment. (I certainly read enough stories about him in the last few months.)
_________________
_{still Quiz Olympiad champion. Must get a life.
New definitions: COFFEE - someone who is coughed upon}

[Lepton*]

DG: I think so. He was on the ISS when this thing started, and I get thousands of news stories on google news.

PuzzleScot: I am quite fortunate that he did not perform EVA because I could not think of the name of an astronaut who had, and I would have had to answer "Yes, I am Guy Laliberte" to your question. (oh, and I must have missed the word "dynamic" in your question... Lenz's is also an energy minimization law)

[Zag]

I think there is no argument to say that he is more famous than Botticelli. On the other hand, since we allow research for general questions, I think it is an unnecessary restriction, as well. The "more famous than Botticelli" rule is more for when you are playing without research allowed.