John Pullar-Strecker has left his post as manager of New Star's technology fund after a long period of ill health.
Pullar-Strecker has not been involved in managing the £325m fund since the start of the year, with deputy Neil Campling taking over control.
New Star would not comment on whether the decision to part company was reached by mutual consent.
Campling will run the fund under the supervision of deputy chief investment officer Mark Beale.
New Star says Beale's specialism in North American equities makes him a good fit because 70 per cent of the fund's portfolio is based in North America.
The fund is one of six that New Star bought from Aber-deen Asset Management in February 2003.
Pullar-Strecker and Campling both worked together at AAM before joining New Star. Pullar-Strecker worked for 10 years at Provident Mutual before his spell at AAM, where he became head of its global technology desk in 1998.
New Star marketing director Rob Page says: “John Pullar-Strecker left the company at the beginning of June. The fund will be run by Neil Campling under the supervision of deputy CIO Mark Beale. With Mark's experience in North American equities, the fund is in very safe hands.”
New Star is also strengthening its technology team with the appointment of senior technical analyst Hitesh Thak-rar, who joins later in the summer from Morley Asset Management.