Frank Weinhold received his PhD from Harvard and held postdoctoral and teaching appointments at Oxford, Berkeley, and Stanford before moving to the University of Wisconsin-Madison in 1976, where he served as Professor of Chemistry and a member of the Theoretical Chemistry Institute until achieving emeritus status in 2007. He is the author of more than 170 technical publications and software packages, including the Natural Bond Orbital (NBO) analysis program, widely incorp-orated in modern ab initio quantum chemistry packages. In addition to the metric geo-metric theory of equilibrium thermodynamics, Dr. Weinhold's research examines upper and lower bounds for quantum-mechanical properties, complex-coordinate rotation methods for autoionizing resonances, and quantum cluster equilibrium descriptions of water and other H-bonded fluids.