David T. Pegg is an Australian theoretical physicist whose most notable contribution is the successful formulation of a quantum phase operator (along with S. Barnett).[1] This is not a small achievement as even Dirac failed on the endeavour. The trick is to truncate the Hilbert space.
He has various interesting—somehow conceptual—contributions on such important questions as the nature of time.
He also interests us for his study of correlations in three-level atoms,[2] and quantum coherence,[3][4][5] among other things.