Professor Bowen's research interests are centered around clusters and nanoparticles. Clusters are aggregates of atoms and/or molecules held together by some of the same interatomic or intermolecular forces which are responsible for cohesion in solids and liquids. Clusters are thus finite-size microcosms of the condensed phase, the realm in which most chemistry occurs. A major objective of Dr. Bowen's research is to provide a molecule's eye view of many-body, condensed phase interactions. The study of size-specific and composition-specific clusters provides an incisive means of addressing this fundamental and longstanding problem in physical chemistry.