Fotini Markopoulou is a hardware tech designer and theoretical physicist. She is co-founder and CEO of doppel, a wearable tech company that uses cutting-edge research in psychophysiology, the study of how the mind and body affect one-another, to create technology that changes how we perceive, feel, and behave. Prior to doppel, Fotini was a founding member and faculty at the Perimeter Institute for Theoretical Physics in Canada, one of the premier institutes on the frontiers of theoretical physics. She has been a visiting professor at MIT and the Santa Fe Institute, as well as Humboldt fellow at the Max Planck Institute for Gravitational Physics in Berlin. Her work in physics focuses on quantum cosmology, complex systems and networks. Her design work is on the interface between systems design and personal experience.