Kirkpatrick formerly held a senior role in the kitchen team at the Clapham Old Town-based restaurant before leaving to become senior sous chef at Alex Dilling at Hotel Café Royal.
He has previously worked at Claridge's Hotel, training under the Royal Academy of Culinary Arts, and undertook a two-year stint at the world-renowned Eleven Madison Park in New York.
"Harry is one of those chefs you come across only a handful of times. An inspirational chef and leader, with a true passion for excellence, a love for produce and a future industry leader," says Adam Byatt, chef-patron at Trinity.
"I am delighted to welcome Harry back to Trinity to lead his kitchen team forward gastronomically and to mentor him into the restaurateur he will become, allowing him to grow our guest experience to be the very best it can be."
Trinity is currently ranked at number 34 in the list of the UK's Top 100 Restaurants