Sam Hallinan will take up the managing director role at Nikko AM Australia on 1 April 2015, replacing outgoing boss Mike Davis.
As well as heading up NAB AM's investment management division, Mr Hallinan was also the managing director of NAB AM-affiliated boutique fund manager Antares Capital Partners.
Nikko Asset Management president and chief executive Takumi Shibata said he expected Mr Hallinan to build on the foundation put in place by Mr Davis.
Mr Hallinan said Nikko AM presented him with an "exciting challenge".
"The company has excellent core capabilities on a global basis in the asset classes investors demand, giving us a very solid platform for growth in the months and years ahead," he said.