Cheryl Shrock is a retired Professor and Chairperson of Computer Aided Design at Orange Coast College in California. The AutoCAD ExerciseWorkbooks are the result of both her teaching skills and her industry experience. She also is an Autodesk(R) registered author. Steve Heather is a former Lecturer of Mechanical Engineering and Computer Aided Design in England, UK. For the past 8 years, he has been a Beta Tester for Autodesk(R), testing the latest AutoCAD(R) software and is a member of the AutoCAD(R) Customer Council. He is the co-author of the bestselling series of Beginning and Advanced AutoCAD(R) Exercise Workbooks. Previous to teaching, and for more than 30 years, Heather worked as a Precision Engineer in the aerospace and defense industries.