Beckett the new manager to Abdullah.
Currently based in the head office of the British Bloodstock Agency, where he has worked for 22 years, Beckett will take up his new position on February 1.
He will manage 150 horses, handled by five trainers in the UK and four in France.
Among the best are the Henry Cecil-trained Bionic, a leading fancy for the 1,000 Guineas, the Barry Hills-handled Dewhurst runner-up Auction House and, in France, Pulci Purse and Silver Star, both in the hands of Andre Fabre.
"I'm greatly looking forward to the new challenge," said Beckett, 44, who is the eldest son of Jockey Club member Lord Grimthorpe and the brother- in-law of former trainer Mark Smyly.
"I was drafted in to the BBA as a cadet and it was my first proper employment," he added. "I've not yet met Prince Khalid but I imagine my role will be very much the same as Grant's."
Among the best-known horses Beckett has purchased for clients in recent years were Duck Row and Teapot Row, both on behalf of the Duke of Devonshire, and he also played a major part in the deal which saw Saumarez change ownership before the 1990 Prix de l'Arc de Triomphe.
Duck Row finished sixth in this year's 2,000 Guineas and third to Dr Fong in the Group 1 St James's Palace Stakes at Royal Ascot, while Teapot Row was successful in three of his four appearances as a juvenile.
Beckett succeeds Pritchard-Gordon, the Prince's racing manager for 16 years, who has decided to move on to work on other projects within the owner's Juddmonte Farm organisation.
Pritchard-Gordon's duties will include detailed documentation of every horse that has raced in the Prince's colours at home and abroad, to serve as both a record of their achievements and a reference for future matings.
Of Beckett's appointment, Pritchard-Gordon said: "Teddy has come the traditional route of so many other racing managers.
"The likes of myself, Anthony Stroud and Alan Cooper were all bloodstock agents before moving on to our current role."