Sure! That sounds like a great way to start stuff. He's been in the city for a few years (about 5 or so), so she could have found an ad or whatnot however far back you like!

Whenever he figures out the physics lady who hired him is the same one as on Retrospec, he'll definitely be more inclined to keep up with her, too. He would say it's for practicality's sake, given the whole monster business and needing more allies. Excuses, excuses...