Yes, he worked with engineers, but he would be the first to tell you he is not an engineer himself. From his book The Dilbert Principle (page 171):

For the record, I am not an engineer by training. But I spent ten years working with engineers and programmers in a variety of jobs. I learned their customs and mannerisms by observing them, much the way Jane Goodall learned about the great apes, but without the hassle of grooming.