The concept of feedback is central in the study of systems and control. Feedback loops naturally appear in the most basic biological phenomena, including macroscopic scale (population evolution, extinction, etc.) but also physiological function, for example, regulation of glucose level in the blood. In Engineering, feedback has long played an important role in mechanical, electronic, and now also digital systems. More generally, systems theory and feedback are central to understanding, analyzing, and designing systems with interconnected components. The purpose of this class will be to gain a basic intuition for and understanding of, linear feedback systems, and also to develop the mathematical tools to understand the basics of design and analysis of single-input single-output feedback control systems.