Whose famous conjecture is paraphrased as "space, time, and matter"?

The person who came up with this conjecture was Albert Einstein

John Archibald Wheeler

Explanation:

the famous conjecture "space, time, and matter" is given by John Archibald Wheeler.

Albert Einstein stated that the fourth dimension is space time.

But John Archibald Wheeler was the physicist who later collaborator of Albert Einstein and work on the mission to achieve unified field theory.

John Archibald Wheeler stated that space time tells matter how to move and matter curves space time.