We design and make homogeneous catalysts for organic synthesis. Our three main approaches to this challlenge include: 1) Design and synthesis of unique catalyst structures; 2) Analysis of catalyst selectivity, activity, lifetime and scope to achieve a comprehensive picture of catalyst performance; and 3) Mechanistic interrogation via the interrogation of potential catalytic intermediates and/or deactivation products. We target transformations that utilize abundant and clean substrates (i.e. O2 or H2O) or that generate minimal waste products.