Laplace may have been the most forceful exponent of "hard core reductionism" by claiming that all future (and past) conditions of the universe are inherent in the state of the universe at any specific time.  His preeminence in celestial mechanics suited him for this outlook.
 _________________________________________________________________________

LAPLACE

Sampling of Writings With Reductionist Flavor

Marquis Pierre Simon de Laplace was one of the founders of the reductionist tradition. He wrote in his Philospohical Essay on Probabilities (1814): "An intellect which at any given moment knew all the forces that animate and mutual positions of the beings that comprise it, if this intellect were vast enough to submit its data to analysis, could condense into a single formula the movement of the greatest bodies of the universe and that of the lightest atom: for such an intellect nothing could be uncertain; and the future just like the past would be present before its eyes." [This passage may have been read by H. G. Wells, and could have inspired his "Universe Rigid" essay, and later The Time Machine (after the Universe Rigid manuscript was lost by the publisher).]

___________________________________________________________________

This site opened:  November 28, 1999.  Last Update: December 29, 2005