design for the next generation of space suits. The design of a space suit needed a deep understanding of physiology. As Iberall was studying this problem, his oldest daughter got polio and he went searching for the most innovative ideas to save the functioning of her afflicted leg. He found Rene Cailliet, a newly minted MD at the Kabat-Kaiser Institute who taught Iberall physiology. Later, as a Professor of Medicine at UCLA, Cailliet went on to become the author of the widely known series of textbooks on musculoskeletal medicine, and some of his earliest ideas thereby became incorporated into space suit design. Iberall also learned physiology from his mentor, neurophysiologist and cybernetician Warren S. McCulloch. As they worked on biophysical research for the NASA exobiology program analyzing the dynamics of mammalian physiological processes, initial ideas that would become homeokinetics began to emerge. In 1967, they performed a complete systems analysis of the daily activities that constitute human behavior. Homeokinetics—The Physics of Complex Systems Homeokinetics is the study of complex systems—universes, galaxies, social systems, people, or even systems that seem as simple as gases. The entire universe is modelled as atomistic-like units bound in interactive ensembles that form systems, level by level in a nested hierarchy. Homeokinetics treats all complex systems on an equal footing, both animate and inanimate, providing them with a common viewpoint. The complexity in studying how they work is reduced by the emergence of common languages for all complex systems. Life, birth, and death of complex systems are bound in hierarchical processes that have both side-side and in-out components. In common with the simpler counterparts, complex systems exhibit rest phases, smooth or creeping flows, turbulence, and chaotic phases; they alternate in storminess and placidity, as well as in their intermittence and changeability. While working at NBS on the problem of humans in high altitude space, Iberall was led into more and more interdisciplinary research using kinetic theory to develop instrumentation covering the major variables of pressure, temperature, density, and flow, both steady state and dynamically changing. Working on the applied problems of the aircraft industry, meteorology, and high altitude military led to his studies of high speed so-called speed-of-sound rates of flow, to more than one phase flow (e.g., gases and liquids), two or more stream flow theory, metastability, solid state metals research both for steady state loads and dynamic (or changing) states. This irrevocably led to