Traditionally, a psychologist is known to work in clinical settings, directly with people experiencing psychological difficulties, within a healthcare structure. This is still the premise; however, the foundational knowledge and understanding of human behaviour has driven psychologists into a new, previously unconsidered professional field: the healthcare and pharmaceutical industry. This industry is pivotal in clinical drug development, new discoveries, innovation, and the reach is endless. So, what is a psychologist doing working in this environment? This book offers insights on how to build successful patient engagement strategies based on behaviour science and the real-world experience of a psychologist working in the pharmaceutical industry.