Matthew Beesley, group head of investments at GAM Investments, will be departing from the firm in 2020, a spokesman said.
Mr. Beesley has decided to pursue career opportunities outside the firm. He will not be replaced, and his responsibilities will be assumed internally, the spokesman confirmed.
Steve Rafferty, group chief operating officer, will take over Mr. Beesley's responsibilities for front-office controls and trading. Mr. Beesley did not manage any client money at GAM. Mr. Beesley's business management duties will be assumed by the respective heads of the two investment groups: Anthony Lawler, head of systematic and solutions, as well as discretionary; and a new head, who will be hired in the coming months.
Mr. Beesley is due to leave GAM in the second quarter of 2020 following a transition of his responsibilities.
GAM had 135.7 billion Swiss francs ($136.9 billion) in assets under management as of Sept. 30.