@OP question : depends what you mean.
If you mean, "do two or more things at the same time almost as well as doing each of those individual things alone", then most likely NO.
And I doubt anybody could unless any of those things only required a fraction of the maximum possible concentration to begin with.
If you mean, "do two or more things at the same time, with a radically decreased efficiency, but still adequately", then YES.
If you mean, "do two or more things at the same time, with a radically decreased efficiency, but still adequately AND take about as much time to do everything as it would have taken to do each individually in sequence", then possibly, depending on whether any of them involved dead times or not.
Oh, by the way, people that heavily multitask get WORSE at multitasking efficiency the more they multitask.
It's probably the only thing people get less proficient at with practice.