Mr. Percy was the owner of the company Percy Import/Export. (It is not really clear exactly what Percy was im- and exporting. Upon being questioned, he just claimed that he is in the "dream business".) Percy was the only person willing to hire Shelley Winters as his secretary when she was a zombie. (Though probably not out of pity, he just wanted someone who can keep her mouth shut.) This ended badly though - during a golf trip, Shelley's zombie instincts took over, and she began to devour the brain of her boss.
Amazingly, he survived this (according to Tim Jones, because Shelley ate the 90 % of his brain that nobody ever uses ), and so he was able to continue his business, a few years later hiring, amongst others, Mad Terry and Eustace Boyce. The conditions they got hired for apparently left a lot to be desired, though. Percy's former employee Shelley checked Eustace's contract, and wasn't exactly thrilled with what she saw.
Another company possibly owned by Percy might be Percy Peas. The huge letters on the roof of its factory, spelling out "PEAS + BEANS", could be considered to be a distinctive feature of Tackleford's cityscape, due to being visible across a vast era of the town. Ryan Beckwith was once an employee here, after he left school in 1996, and Tim Jones also worked summer jobs there. It was run in the past by Percy's grandfather, an "old-fashioned industrial philanthropist" who made a point of providing hot meals to his workers "whenever the wheels turn".
Furthermore, Percy was a board member of the Tackleford City FC. This is probably why he also got invited to the party of Yuri Kropotkin, the owner of said football club. He also seems to function as an official sponsor of the team, given that his name is written on Tackleford FC merchandise, like e.g. sweaters.
Percy Import/Export changed locations between Shelley's and Eustace's respective employments. At first it was located in an old red brick building. Then later, it moved into a more modern house with a glass facade  - the former headquarters of Hugo Industries!
If you look closely, you can see scars on Percy's forehead, very probably stemming from his unfortunate zombie-encounter with Shelley.