Niki Efthymiou is a Ph.D. student at the school of Electrical and Computer Engineering, National Technical University of Athens (NTUA), under the supervision of Prof. Petros Maragos. She is working primarily on computer vision problems associated with Human-Robot Interaction. She is a researcher at the Computer Vision, Speech Communication, and Signal Processing Group at NTUA and her research interests lie in the fields of gesture, action, and emotion recognition, with a focus on Child-Robot Interaction. She received her diploma degree in Applied Mathematics and Master's degree in Computational Mechanics from NTUA.