The book introduces the theory and operating principles of turbomachinery in air breathing engines. The book gives a comprehensive coverage of a wide range of topics including basic thermodynamics, fluid mechanics, aerothermodynamics, subsonic and supersonic De Laval nozzle as it applies to bladed turbomachinery components, boundary layer principles, aircraft and space flight engines designs, engine materials, components and structures. The fundamental concepts of turbomachinery design for air breathing engines are spelled out.The book provides an excellent foundation in turbomachinery in air breathing engines theory for aerospace or mechanical engineers. It is presented at the graduate and senior undergraduate level and provides a comprehensive coverage of all the fundamentals in a student-friendly manner that also works well as a professional reference.The book is well written and well organized and facilitates learning by laying a firm base and then building on that foundation.