Charles E. Weir (September 29, 1911–April 4, 1987) was a chemist and physicist known for being one of the four co-inventors of the diamond anvil cell at the National Bureau of Standards in the late 1950s, with Alvin Van Valkenburg, Ellis Lippincott and Elmer Bunting. Weir had the principal role in designing the first diamond anvil cell, and built it by hand using the machining tools available in his lab.[1] The original device was first described in a paper[2] on high-pressure infrared absorption measurements of calcium carbonate. Later, Weir collaborated in the development of diamond anvil cells for powder[2] and single-crystal[3][4]X-ray diffraction.