Adrian Wyatt conducts elegant experiments on the fundamental properties of quantum fluids. He has developed sensitive bolometric techniques with which he can observe and study directly the propagation of thermal excitations (phonons and rotons) in the superfluid phase of liquid helium-4, and with which he has discovered and studied the process of quantum evaporation in which a single such excitation expels a single atom from the liquid. He has also used ingenious techniques to study the wetting of surfaces by superfluid helium, placing him again at the forefront of a fundamentally interesting field of research.