Jules Henri Poincaré (1854-1912): mathematician, physicist, and philosopher of science; mathematical 'universialist'; considered by many one of France's greatest theoretical scientists; major contributions to such diverse fields as analysis, algebra, topology, astronomy, and theoretical physics; revolutionized celestial mechanics; wrote extensively on the philosophy of science. Currently available: The Value of Science: Essential Writings of Henri Poincare by Henri Poincare & Stephen Jay Gould (Editor); collects his three most important books: Science and Hypothesis (1903); The Value of Science (1905); and Science and Method (1908).

Other Links:
Henri Poincare Chaos Group (University of Maryland at College Park)
Internet Encyclopedia of Philosophy
Bruce Medalists