I hope this is the right place to ask this about EXIF information. I include a screen shot of the EXIF info on one of my recent shots. The info shows Artist is Russ Colledge, and Copyright is also Russ Collegde ! Who is this person ?
Like @scott199 it would have been entered by the previous owner. You need to either change those settings to yourself or do a full reset to clear those settings. Have a look in the setup menu (it’s setup menu page 5 on the mk4).