The phrase "a former master of" is correct and usable in written English.
It can be used to refer to someone who previously held a position of mastery or expertise in a particular field or discipline.
Example: "He is a former master of the art of negotiation, having trained many successful diplomats."
Alternatives: "an ex-master of" or "a past expert in".
Sir John was a former master of Christ's College, Cambridge, where he spent his entire academic career.
Alistair Jackson, a former master of the Cattistock Foxhunt and southeast spokesman for the BFSS, was arrested in Yeovil, Somerset, after allegedly punching a hunt saboteur.
His grandfather Charles Raven, a former master of Christ's College, Cambridge, and university vice chancellor, was a pacifist and Christian socialist who wrote four books on natural history.
I could have been talking to anyone with a passion for the camera, not a former Master of the Universe who was once making so much that he failed to spot that some of it was vanishing.
But Ronald Dworkin, a former master of Trumbull College at Yale, where thousands are planning a massive "convocation" this weekend over the upcoming murder trial of a Black Panther leader, questioned whether the spirit governs.
Perhaps if, as Lord Donaldson, a former master of the rolls, once suggested, they were forced to pay the cost of judges and court staff too, they would be more circumspect in their suits.
"There are a lot of people who want to write plays and very few people who want to give them financial encouragement," said Mr. Lonergan, who is an Tisch alumnus and, as a former master playwright, a beneficiary of the Goldbergs' largess.
The house shows the influence of different generations of owners: a former master bedroom was added around 1940, for example, while two upstairs bedrooms date to the 1800's.
Tanya Adrusieczko, a former master's student at the University of Saskatchewan, hoped to apply for the a scholarship to attend the London School of Economic and Political Science LSEE).
Under the direction of John Lewis, a former master, it pioneered Nuffield Physics in the 1960s, Science in Society in the 1970s, and the Diploma of Achievement in the 1990s.
William H. Bossert, a professor and former master of Lowell House, suggested that Harvard had preserved the bells in a way that the monastery might not in today's Russia.
