Morgan Cole partners have chosen John Cole as the firm's new chairman.
The appointment is part of a management shake-up and follows the firm's decision to cull partners in order to guarantee more profits for its remaining lawyers.
Cole is understood to have beaten competition from the incumbent co-chairmen, Guy Clarke and John Moisson.
Moisson and Clarke are losing their positions on the firm's board of directors following the election result, says David Main, Morgan Cole's chief executive.
A spokewoman says: "Guy Clarke and John Moisson will remain as partners within the firm and will concentrate on client focused activity."
Cole is a former managing partner of the former Cole & Cole which, merged with Welsh firm Morgan Bruce last year.
Earlier this year the group was in a further merger with London firm Fishburn Boxer to form a heavyweight M4 corridor firm with more than 100 partners.
Cole held the position of partner in the business services division immediately prior to his election to the newly-amalgamated post.
The spokeswoman says: "The appointment of the new chairman will not affect the overall structure of the firm. However we are currently in the process of appointing divisional directors."
Insiders say that it is expected that Moisson and Clarke will be appointed as divisional directors, positions which will reinstate them as members of the Morgan Bruce board.
It is thought that there are four divisions, covering litigation, business services, property, and insurance litigation.
Main was reluctant to discuss the appointments before the results of a partners' ballot had come through.
He says: "It's very much about internal management, and we are still going through that process."
He adds: "The period of harmonisation following the merger last year between Morgan Bruce and Cole & Cole was always going to be a challenging time and we decided that this was best handled by joint chairmen, one from each of the practices.
"It was, however, always our intention to return to one chairman as soon as practical.
"In view of the success of the merger to date, and in order to streamline management, it made sense to proceed now with the appointment of a single chairman."
Cole is expected to take up his new function on 1 November.