Gibbons will be responsible for developing new business and will oversee banqueting sales and planning when the hotel opens early next year.
He was previously director of conference and banqueting at the London Hilton on Park Lane.
Park Plaza Westminster Bridge London will offer a 1,200sqm ballroom and 31 additional meeting rooms.
Park Plaza Westminster Bridge London general manager Andrew Swindells said: "David's expertise will help ensure that we not only provide our guests with spectacular meeting space, but provide outstanding support for conference and event organisers."
The 1,021-room hotel will be located on London's South Bank near the London Eye, London Aquarium and Royal Festival Hall.
It will offer 2,700sqm of meeting space, a spa with eight treatment rooms and a fitness centre incorporating a 15-metre swimming pool.