Only if you care about formalities and what not. But it doesn't have to be that offish.

[ if their paths had managed to cross back when she used to be more of a buttoned-up type of gal, she would've been everything he probably expects from the look of a psychiatrist, collared shirts and thick-framed glasses. but there's no sign of the former harleen quinzel in her demeanor or her wardrobe as she lets her skates drop to the sand by her feet. ]

Just go with Harley. Keep it simple. 'Specially for a mostly retired doc who doesn't even have an office. Or office hours.