What is the voice embodied? How is it possible to understand the voice as a gesture: a movement perceived as body? What are the creative processes of expressing voice? An interdisciplinary study into the artistic training and performance of voice, the aim of this thesis is to explore these research questions by examining three contemporary voice practitioners in conjunction with my practice. The practitioners, Noah Pikes, Enrique Pardo, and Linda Wise, are original members from the Roy Hart Theatre (1969-1990). Founded in the 1960s on the pioneering work of the German musician and voice teacher Alfred Wolfsohn (1896-1962), Roy Hart and the Roy Hart Theatre extended Wolfsohn's distinctive interdisciplinary approach to voice training within theatre practice. This investigation brings together the practices of Pikes, Pardo, and Wise for the first time to explore a lineage of Wolfsohn and Hart's work. Examining the practitioners' interdisciplinary methodological approaches to voice training and performance, the research reveals how these original members of the Roy Hart Theatre are challenging conventional methodologies to the way in which the voice of the actor-singer-dancer is trained through practice. My interaction with these international practitioners and their practices produced primary documentary evidence in the form of video footage and interviews. This primary research material presented within the thesis, was filmed in the artists' studios in London, Zurich and Paris over a five-year period, and provides rare experiential insights into these contemporary interdisciplinary approaches to training voice and performance in multicultural professional workshop settings. In addition, the thesis contains DVD recordings of the documentary: 'The Whole Voice' (2002) detailing Pikes' praxis, and my contemporary solo theatre performance: 'The Badlands' (2004). Demonstrating elements of the practices central to my investigation, the performance of the 'The Badlands' should be viewed as one example in practice, of how the ideas explored in the thesis might be realized. Whilst the study of artistically training and performing voice is a practical endeavour, pedagogically the practice poses a number of complex theoretical questions concerning the nature of how the integral brain/body is experienced. My research endeavours to bring theory and practice together. It reveals variations in the practitioners' praxes, including a shift from Wolfsohn, who drew directly from the psychological theories espoused by C.G Jung, to Post-Jungian perspectives. The study explores the significance of this development, placing a particular emphasis upon how agency and the imagination are conceived in practice. Exploring beyond the fundamental Jungian and post-Jungian psychological theoretical frameworks underpinning the practices central to this study, I propose through my practice to examine the significance of extending Wolfsohn's original ideas about the voice embodied from an existential phenomenological line of thought and the parallels this philosophy shares with more recent research stemming from neuroscience.