Immigration law is constantly evolving and staying up to date with case law, regulatory and policy changes has never been so important. This book contains a detailed review of today's most common US work visas including, TN, L-1, E-1, E-2, H-1B, O-1 and more. The history of US immigration and important admissibility issues are also covered. The book provides the reader with a clear understanding of complex issues, concepts and principles within the modern immigration system.