Professor Padden-Row is distinguished for his contribution to the interpretation of long-range electron, hole and energy transfer. He has synthesized rigid saturated hydrocarbon bridges with systematically variable length and geometry, which can link donor and acceptor species, thus permitting for the first time unambiguous definition of the transfer pathway, and has demonstrated that fast transfer can occur via a through-bond mechanism at distances up to 17 Angstroms. Design and interpretation of bridge functionality has been fruitfully guided by innovative quantum chemical calculations. His work is of fundamental importance for the interpretation of thermal and photochemical long-range electron transfer, particularly in biological systems.