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Groups:

CAT: grumpy, fish, nap, walk
LIVE: music, go, stock, stream
DEAD: heat, line, end, lock
BOX: seat, lunch, sand, beat

(Originally I had deadbeat and lockbox which also fits, but the intended solution was deadlock and beat box).

Pointing to:

Schrodinger's cat, the thought experiment in quantum physics about a cat in a box that could simultaneously be alive and dead. Which means the answer is Erwin Schrodinger, the Nobel winning physicist who invented Schrodinger's cat.

Groups:

CAT: grumpy, fish, nap, walk
LIVE: music, go, stock, stream
DEAD: heat, line, end, lock
BOX: seat, lunch, sand, beat

(Originally I had deadbeat and lockbox which also fits, but the intended solution was deadlock and beat box).

Pointing to:

Schrodinger's cat, the thought experiment in quantum physics about a cat in a box that could simultaneously be alive and dead. Which means the answer is Erwin Schrodinger, the Nobel winning physicist who invented Schrodinger's cat.

Title refers to:

Quantum mechanics, which is normally used in micro systems, being theoretically valid (though computationally impractical) for macroscopic systems. (From Aaron Hayman in comments)

Groups:

CAT: grumpy, fish, nap, walk
LIVE: music, go, stock, stream
DEAD: heat, line, beat, end
BOX: seat, lock, lunch, sand

Pointing to:

Schrodinger's cat, the thought experiment in quantum physics about a cat in a box that could simultaneously be alive and dead. Which means the answer is Erwin Schrodinger, the Nobel winning physicist who invented Schrodinger's cat.

Groups:

CAT: grumpy, fish, nap, walk
LIVE: music, go, stock, stream
DEAD: heat, line, end, lock
BOX: seat, lunch, sand, beat

(Originally I had deadbeat and lockbox which also fits, but the intended solution was deadlock and beat box).

Pointing to:

Schrodinger's cat, the thought experiment in quantum physics about a cat in a box that could simultaneously be alive and dead. Which means the answer is Erwin Schrodinger, the Nobel winning physicist who invented Schrodinger's cat.

Groups:

CAT: grumpy, fish, nap, walk
LIVE: music, go, stock, stream
DEAD: heat, line, beat, end
BOX: seat, lock, lunch, sand

Pointing to:

Schrodinger's cat, the thought experiment in quantum physics about a cat in a box that could simultaneously be alive and dead.

Groups:

CAT: grumpy, fish, nap, walk
LIVE: music, go, stock, stream
DEAD: heat, line, beat, end
BOX: seat, lock, lunch, sand

Pointing to:

Schrodinger's cat, the thought experiment in quantum physics about a cat in a box that could simultaneously be alive and dead. Which means the answer is Erwin Schrodinger, the Nobel winning physicist who invented Schrodinger's cat.