Mercer has named senior partner Tom Murphy as head of investment management for the US, effective from 1 September. 

Murphy used to be the head of investment management for EMEA - a position he held for five years. He has been with the company since 1997. In his new role Murphy remains a member of the investment management leadership team and will be based in Boston. 

Following this appointment, Ken Crotty, who held both the US investment management and the global chief operating officer positions, will now focus exclusively on being COO. Murphy reports directly to Rich Nuzum, the president and global business leader of the firm's investment management division.

Mercer has around 20,000 staff in over 40 countries.