As AR/VR/MR developments progress at a rapid rate, the need to personalize experiences and interactions with realistic and believable manifestations of human actors, live participants themselves and virtual agents (tasked to represent virtual people, etc.) has become an important expectation and goal. Social VR, Virtual Theater, Musical performances, Storytelling, history and educational experiences along with a myriad of other AR/VR/MR experiences will require these dynamic, believable human simulations which act, and re-act, with enough precision to satisfy our complex neurologically ingrained perceptual needs, as they relate to realistic and comfortable human interactions in synthetically generated and augmented environments, etc. The speaker will discuss state-of-the art development, techniques and agenda required to support the field of human construct development, tracking and behavior, including physical 3D body / form capture, facial expression / body motion capture designed to inhabit interactive, immersive environments and scenarios. Acting / performer concerns will be discussed, as well as, the progress of available commercial technology needed to address the complex aspects of creating ideal, believable virtual personae and the desired habitation of these "constructs" into the virtual and augmented world(s) and what to expect from this process going forward.