Victor Wowk, P.E., is president of Machine Dynamics, Inc., based in Albuquerque, New Mexico, which specializes in vibration analysis, balancing, alignment, and health monitoring on machinery. The company manufactures a shaft alignment system. Mr. Wowk, a practical hands-on engineer, regularly performs alignments, and teaches alignment training workshops. He is the author of two other books published by McGraw-Hill, Machinery Vibration: Measurement and Analysis (1991), and Machinery Vibration: Balancing Strategies (1994).