Jati has a long career in hospitality, having been instrumental in establishing private dining during a 10-year tenure at Nobu.
He also held positions as restaurant manager for Italian chef Antonio Carluccio; the Savoy hotel London; and the Walt Disney cruise line.
Jati plans to bring a new vision for the group's portfolio of food and beverage offerings starting with the transformation of the May Fair bar, which is due to re-open on 14 September.
He said: "The May Fair is a London institution. Our plans for transforming the bar - our signature drinks, a new live kitchen and a refreshed menu - will see it claim its position as the most decadent lounge bar at the heart of this district - London's luxury quarter."
The new bar also plans to offer weekend brunch and DJ evenings.
Inderneel Singh, general manager of the May Fair hotel, said: "Amir's experience and passion for hospitality will be instrumental in our plans for the group in the coming years.
"His experience in the industry to date demonstrates his ambition to take an established brand and export its signature experience to a new arena while maintaining quality and the luxury feel.
"We will be announcing further developments across the group over the coming months as we look to build on this strength and capability."
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