A knowledeg engineer is a professional who works with a domain expert to elicit and represent the expert's knowledge for use in an expert system or other form of AI.
Defined on page 432
Used on Chap. 2: pages 19, 33, 34; Chap. 18: pages 423, 427, 431, 432, 434, 438, 440; Chap. 23: page 562