Instruct: Classify the given review into positive or negative sentiment.
Query: Excellent Read with Insightful Exercises

John Hershey, a creative luminary at General Electric, has out-done himself in this excellent work. The material is well-organized and clearly explained. The execises are fun and insightful. This book sparks one's interest in a topic that can be dull and dreary to many people. This is a must-read for anyone in the field.Well done!