David Simpson, previously chief relationship officer with SEI Investments Company, will take on the newly created role working with the executive team based in London.
GBST managing director Robert De Domenicis said the company "expects to benefit" from Mr Simpson’s knowledge of international markets.
"David's experience helping large organisations to provide full-service solutions of more than 25 years, including investment processing, administration and infrastructure operations, will be a great asset for us as we pursue global growth," he said.
Mr Simpson is responsible for driving the growth of GBST's retail savings platforms and managing client activity throughout the EMEA regions.
Prior to his employment with SEI Investments, Mr Simpson spent more than 20 years working in various roles with Barclay’s Wealth.
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