Christine Packham

There's no point talking to the entire team if only one team member is causing a problem. If you have this discussion with the entire team the ones who aren't late for work will decide that you're accusing them of doing something they're not, and you will therefore alienate them. As a new manager, alienating your subordinates for no good reason is something you want to avoid like the plague! (Actually all managers, new and old, should be avoiding alienating their employees.)

Instead, I recommend you have a private conversation with the individual. Give him a list of his late arrivals for the last few months, and ask him why he's consistently late like this. (You need to ask this because he may have some reason, like a disability, that you're legally required to accommodate.) If he can't give you a good reason for the lateness, remind him how important it is for him to come to work on time, and that staying late to make up for his tardiness is not an option. Conclude the meeting by advising him that if he continues to be late for work, he could lose his job. Document everything said in the meeting, and put the documentation in his personnel file.

If he's late again anytime within a few months of this conversation, fire him.