We are theoretical physicists, working on phenomenology of high energy physics. High energy physics, also known as particle physics, investigates the elementary particles in Nature and the interactions among them. It asks the most basic questions in physics, and seeks for the laws of Nature from which all phenomena can, in principle, be understood. The word “phenomenology” refers, in this context, to theoretical work that is undertaken in close relation to laboratory experiments. The Standard Model is a very beautiful theory, describing the strong, weak and electromagnetic interactions. It explains almost all experimental results related to these interactions. Yet, it fails to account for neutrino masses, for dark matter, and for the matter-antimatter asymmetry of the Universe. We study these failures and other shortcomings of the model in the context of collider physics, flavor factories, and particle cosmology.