Why were the Hohokam referred to as brilliant engineers?
The Hohokams were referred to as brilliant engineers because of the complex and magnificent system of irrigation canals they created to survive the dry desert.
If you are referring to Chemical Engineers, a Chemical Engineer is a person who works in the field of engineering, specifically orientated towards physics, chemistry, as well as processing or supervising the processing of raw materials into usable or valuable materials. Chemical Engineers are sometimes referred to as Process Engineers.
Chemical engineers is professed in designing a production plants, the scope of knowledge must cover from mechanic, civil, electrical, environmental impacts to management. Chemical engineers, while may not know in depth of the above mentioned field, must be able to coordinate the work of various engineering field and communicated with the managerial levels.