1. Being based somewhere. Unless you live out of a steamer trunk, perhaps as a foreign correspondent for The Calcutta Times, you are not based anywhere. You have a home like the rest of us, and you live there.
It ain’t a military installation.
2. The word the. You are not an artist or economist or whatever named John Doe. You are the economist John Doe, as if anyone has ever heard of you.
The economist John Doe will deliver a lecture today at 8 p.m. at the Concert Hall.
Pretentiousness No. 2 is invariable bestowed by a second party, not by you. The second party is trying to give the impression that you are famous even though you are not, often because the second party knows you personally.
If you are famous, you don’t need the the. Everyone already knows of you.
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(Note: The crank Felipe Zapata is based on a Mexican mountaintop.)