Final answer:
The information provided is insufficient to determine which city Rob, the engineer, lives in as the necessary context or data is missing.
Step-by-step explanation:
It looks like the information necessary to answer which city Rob, the engineer, lives in is not provided within the question itself. Given the typical nature of questions related to the professions and locations of individuals, this might appear in a riddle, a logic puzzle, or perhaps it's based on an external text or data set that isn't included in the question. Unfortunately, without additional context or data, it would not be possible to determine accurately whether Rob lives in Los Angeles, New York, Chicago, or Houston solely based on the profession mentioned.
In scenarios like these where there might be missing context or information, it's key to have access to all needed data to make an informed decision or to answer the question correctly. If this problem is part of a larger puzzle or a set of information, please provide the complete details, and I would be more than happy to assist you further.