This document discusses the development of a quantitative theory for estimating the contribution of hydrogen bonding to surface and interfacial tensions and adhesion energies at interfaces. It reviews previous work recognizing the role of hydrogen bonding in various phenomena. A new theory was developed that resolves surface free energy into apolar and acid-base components. This theory provides a quantitative way to evaluate the surface manifestations of hydrogen bonding, unlike previous approaches. It is based on describing hydrogen bonding as an acid-base interaction in terms of Lewis acid-base theory.