My research aims to explore the fundamental interaction between waves and matter by tackling the problem of designing material basic building blocks with properties that do not exist in nature (i.e., metamaterials). These building blocks are programmed to be either passive (i.e., have unprecedented properties through architecture) or active (i.e., change their intrinsic properties in response to an external stimuli). A few examples are the design of the first purely acoustic transistor [Bilal et al., PNAS 2017], the first 3D topologically insulated/protected metamaterials with intrinsic elastic polarity [Bilal et al., Adv. Mater. (1) 2017] and a metamaterial that can guide stress waves by changing its dynamical characteristics on the fly [Bilal et al., Adv. Mater. (2) 2017]. The research nature is highly multidisciplinary as my background spans computer science, mechanical and aerospace engineering, operations research and condensed matter physics.