Erich Gerth, the head of international business at Janus Capital, the fund manager that was last week forced to make a multi-million dollar payout to a former fund manager, has resigned after six years to join Aviva Investors, where he will oversee global business development and marketing.

Gerth was chief executive at Janus International, where he was responsible for the company's institutional business outside the US. He joined the company in 2003, before which he led US sales teams at Goldman Sachs Asset Management.