Former Franklin Templeton equity research director to rejoin firm and retain position as chief executive of Edinburgh Partners.
Merged entity will manage £332 billion of assets for more than six million clients.
Deal creates major force in market making and technology.
Political issues mean future cross-border mergers are less likely to succeed.
M&A activity in the UK jumped 8% in third quarter despite voting to leave the European Union.
The combined entity will manage more than $300 billion of assets once the deal is complete.
Dutch SME group says combined entity will have adverse effect on smaller markets.
Acquisitions will form key part of exchange operator’s growth plans for next three years.
Bank of Singapore will buy Wealth and Investment Management business as Barclays continues to offload non-core divisions and reduce Asian presence.
Financial data provider Markit will merge with US analytics firm IHS in an all-share deal worth around $13 billion.