Bates will oversee the food and beverage operations for the hotel's four restaurants and bars, its in-room dining service, and banqueting across its 35 event spaces and meeting rooms.
He will also lead the change of the hotel's F&B offering, which comes amid a multimillion-pound refurbishment of the hotel that's set to be completed by the summer.
This includes the launch of a new market-style dining outlet within the hotel, which will be designed to 'reflect the energy and diversity of London's bustling food scene'.
Over the last 20 years Bates has held the position of executive head chef at several leading hotels in London including JW Marriott Grosvenor House Hotel; Hilton London Bankside; Beaumont Hotel; and InterContinental Park Lane.
"I am so excited to be joining at this incredible time of change," says Bates.
"Along with my talented team, we will be launching four new restaurants and bars and enhancing the food and drink offering within the conference and events service.
"I'm looking forward to leveraging my expertise and creating incredible culinary experiences for guests.
"We're going to be approaching some of our outlets unlike any other hotel has before, all whilst representing our amazing city - London - creating dishes made with the best locally sourced British ingredients.
"I can't wait for our guests to see what we've been cooking up."