IPA: /ˌɜːrɡəˈnɒmɪst/
KK: /ɜrˈɡɒnəmɪst/
A person who studies how people interact with their environment, especially in terms of comfort and efficiency in the workplace.
The ergonomist recommended changes to the office layout to improve employee comfort and productivity.
Ergonomist is formed from "ergon" (meaning work) and "-ist" (meaning one who practices or is concerned with). An ergonomist is someone who specializes in the study of work and how to improve it for efficiency and comfort.
Think of 'ergon' as relating to 'work' and remember that an ergonomist is someone who focuses on making work better and more comfortable.