On April 20, 1951, L‚on Van Hove presented his thesis ?Sur certaines repr‚sentations unitaires d'un groupe infini de transformations' to the Universit‚ libre de Bruxelles (Free University of Brussels), two days before the University of Grenoble had approved the creation of L'Ecole d'‚t‚ de physique th‚orique at Les Houches (Haute Savoie, France). The first session of the ?Ecole des Houches? began on July 15, 1951, with a month-long course by Van Hove on quantum mechanics. The lecture notes for this course were written for the benefit of physicists who ? like most of their colleagues outside the US, Canada, and England at that time ? did not know quantum mechanics but wanted to learn it seriously. Van Hove's course met their expectations fully. The physics course benefitted from the mathematical expertise of the lecturer, which is also apparent in this thesis. Without his own research as scaffolding, Van Hove could not have built the short and beautiful course which provided the participants with a solid, useful foundation in modern physics.The lecture notes are in French. If they had been in English they would have been published together with the translation of the thesis. The first three pages of the notes are reproduced at the end of this book. The set of notes was reproduced by stencils and distributed to the participants at the beginning of the course.The translation of L‚on Van Hove's thesis was initiated in late 2000, when Bob Hermann, formerly in the Department of Mathematics at MIT, sent to Van Hove's son Michel his view on the thesis: ?I would consider it as one of the most important mathematical physics papers of the past fifty years, containing the key ideas for what has become known as ?geometric quantization.?? Indeed, the thesis is interesting both to historians of science and to theoretical physicists and mathematicians exploring the relationships between quantum and classical physics, based on the Hilbert-space approach to classical mechanics.