The firm has promoted Andrew Shepherd as Zaman’s replacement.
Shepherd, who will remain group deputy chief executive, will chair the boards of the two legal entities within the international operation.
But, due to these commitments, he is stepping down as a member of the Brooks Macdonald group board with effect from 1 April 2019.
He will also pass his responsibility as managing director of UK distribution to co-head of UK investment management John Wallace.
At the same time, Richard Hughes will be appointed deputy chief executive of Brooks Macdonald International, in addition to his current responsibilities as head of business development.
Important part of strategy
Caroline Connellan, chief executive of Brooks Macdonald, said: “International is an important part of our group and our future growth strategy.
“Andrew’s depth of experience and expertise, alongside his people leadership and commitment to client service, will be central to our efforts to revitalise the business so that it contributes strongly to the group’s future success.”
The changes are subject to regulatory approval.