Let’s put it this way:
DQs:
Ah. Yes, Germany is not what I think of when I think “Slavic”! Hmmm.
DQ:
Involved in transportation technology?
One DQ stil reserved.
DQs:
I yield my last earned DQ to whoever would like to use it.
My brain has apparently gone on early vacation; I’ve been completely stumped in the last few rounds. I keep waiting for something to spark an idea, but I can’t even think of intelligent questions to ask.
You could ask about the branch of science he was in 
Was that medicine, or physics, or whatever field you think may have representatives people have actually heard about, stuff like that 
(I’m sorry, I know I should play properly and earn my own DQs first, but right now I cannot for the life of me think of a tough enough IQ to earn one, and, well, since you guys asked…)
DQ: Chemistry or physics?
DQs:
And now, as is the custom, each person who earned a DQ in this game will be allowed to ask one question in the form of “Are you Gustavus P. Skeezleplex, Jr.?”
One final timely clue: People who use Google have the advantage here.
If I could think of anyone who fit the description I would already have asked…
Get thee behind me, Prof. P.…!
Thinking…
[Didn’t mean you should use Google now…]
Oh, good.
Still stumped. I can’t even think of a firstname lastname combination to ask.
Well, since he’s one of the only two Germans I can think of named J. Something who died in the indicated years, I’ll be silly and ask…
DQ: Are you Joseph Goebbels?
(Does political science count as science?)
German scientist, not a chemist, physicist or mathematician, first name begins with J, died between 1900 and 1950, not a Nobel prize winner, but probably famous enough to have a google doodle in his honour (recentlY? Maybe he did his most important work in 1913, or was born in 1863 - or even 1813) and I still can’t get past Johannes Salk who is a fictional person based on my misremembering a name.
No, and no.
I’m out, in case you hadn’t already guessed
So that still leaves Draelin and Zakalwe, unless I missed someone.
I’m out. You stumped me.
And now, since it’s been 2 1/2 days (roughly) since we went to the end-game…
I congratulate fanganga on his/her perspicacity: I did indeed hint at a Google Doodle. This one:
Since it occurred on May 31st, the start of Summer, I find it a need bookend to finish this riddle on Labor Day weekend at the end of Summer.
Julius Richard Petri, inventor of the Petri dish.
Next,
I am E
IQ1: Was a certain type of asparagus named after you?
IQ2: Were the Despensers among your favourites?
IQ3: Did you invent a famous gin?