The XXI International Congress for Analytical Psychology was held in Vienna, the birthplace of psychoanalysis. It brought together an unprecedented number of participants from all over the world and from different fields of knowledge. The theme: Encountering the Other: Within us, between us and in the world, a most relevant and urgent topic of the contemporary discourse among clinicians and academics alike, was explored in a rich and diverse program of pre-congress workshops, master classes, plenary and breakout presentations and posters. The Proceedings are published as two volumes: a printed edition of the plenary presentations, and an e-Book with the complete material presented at the Congress.