This book is meant to serve as a manual on human cognition and digital technologies. It gives a comprehensive overview of what it means to create personality-like, thinking, reasoning, deciding technologies. It reviews the development of cognitive modeling as theory based on the principles of psychology and neuroscience and as used in AI, machine learning and human computer interaction. Inclusive chapters, which are well outlined in this book, include cognitive architectures, knowledge representation, natural language processing, and adaptive learning algorithms. As such, it accentuates how digital personalities complement and amplify real-world application solutions that include a virtual assistant, social robot, autonomous systems, and decision-support systems. Key subjects are supplemented by several case studies and examples from actual lives when the authors demonstrate how prominent cognitive models become the leading ideas for developing health cares, educational projects and smart surroundings. It also discusses useful and interesting ethical and philosophical issues that relate to identity, existence of consciousness, and humans’ interaction with AI. It examines the effect of having digital agents that imitate and emulate humans, as well as to some extent, control them. The book will benefit students, scientists, technocrats, and the common man, ‘Digital Personality A Man Forever’ unravels the missing link between human cognition and technology. This book gives an idea of the further evolution of digital evolution where in addition to the ability to process information, digital systems exhibit qualities that give them characteristics of sentient companions in the post-industrial world.