Discovery of frustrated Lewis pairs: intermolecular FLPs for activation of small molecules -- Intramolecular frustrated Lewis pairs: formation and chemical features -- Frustrated Lewis pair mediated hydrogenation -- Amine-borane mediated metal-free hydrogen activation and catalytic hydrogenation -- Hydrogen activation by frustrated Lewis pairs: insights from computational studies -- Quantum chemistry of FLPs and their activation of small molecules: methodological aspects -- Computational design of metal-free molecules for activation of small molecules, hydrogenation, and hydroamination -- Computational studies of Lewis acidity and basicity in frustrated Lewis pairs -- Solid state NMR as a spectroscopic tool for characterizing phosphane-borane frustrated Lewis pairs.