Baillie Gifford has appointed co-managers on its Japanese Income Growth and Japanese Smaller Companies funds.
The changes will take place with immediate effect.
See joined the Edinburgh based firm as a graduate straight from university in 2012, taking a post in the firm's Japanese equities team.
Meanwhile Hjertman has spent the last two years in the team after joining the firm in 2011.
James Budden, director of retail marketing and distribution at Baillie Gifford & Co, said: ‘Baillie Gifford has a team-based approach to fund management and we see strong merits in the appointment of co-managers across our range of Oeics.’