When addressing someone with a Ph.D. from the Massachusetts Institute of Technology (MIT) who does not have an academic job title, it is appropriate to use "Dr." followed by their full name. This is a respectful and formal way to acknowledge their academic achievement and expertise.
For example, if the person's name is John Smith and they have a Ph.D. from MIT, you would address them as "Dr. John Smith."
It's important to note that the use of "Dr." as a title is common in many professional settings, regardless of whether the individual is in academia or another field. However, some individuals may prefer not to be addressed by their academic title in certain informal situations. If you are unsure about how someone prefers to be addressed, it is always best to ask them directly or observe how others address them in similar contexts. Respecting their preferences shows consideration and courtesy.