In past posts, you've made clear that there's no need in a query letter for biographical information or anything about a platform for a work of fiction, other than previous writing credits or a respected writing award.
Yet I find it hard to imagine that a physician offering a medical thriller shouldn't mention her day job in her query. Ditto for lawyers with legal thrillers and NASA engineers with hard science fiction. Am I to believe that Robin Cook, John Grisham, and Robert A. Metzger omitted their professions from their first queries? Given two well-written queries for a romance set in the Capitol, wouldn't you have slightly higher hopes for the manuscript from the writer that mentioned he was a senator's office manager? (maybe)
Not every writer, of course, has a background that dovetails with their story. I'm sure some good novels about old-west madams have been written by Asian trapeze artists with no direct knowledge of the bordello biz other than a mountain of research. But when you do have a leg-up on your subject matter, is it wrong, especially in absence of previous writing credits, to mention a salient autobiographical detail?
No, it's not wrong, but from my standpoint it's almost a negative.
Just cause you know something doesn't mean you can write a novel about it. Most of the queries I get from lawyers and doctors are crap. Worse than the usual dreck. That's cause they've mostly been used to writing in a totally different form. The only people who write worse than those guys are academics and political pundits.
Lawyers are the alltime leader in this category; they don't know how to leave things to the reader's imaginations. They are used to the form
1. tell people what you're going to say
2. say it
and that is death on toast in a novel.
The other thing is that accuracy doesn't always serve the novelist well. Lawyers and doctors and nuclear engineers love to salt their writing with all sorts of information dumps.
You don't need qualifications to write a novel. You really can just make it all up.