Robeco Institutional Asset Management has appointed Gilbert van Hassel as chief executive and chairman of the management board.

From 19 September, he is to succeed Leni Boeren, who will leave the Rotterdam-based company after the handover has been completed and successors have been appointed for her other board positions within Robeco Group.

Boeren took over in May, when Japanese owner Orix introduced a new group structure that saw the asset management division become one of five Robeco subsidiaries.

As a consequence, three board members, including chief executive David Steyn – appointed in November – left the company.

At the same time, newly appointed supervisory chairman Bert Bruggink – who once served as chief financial and risk officer at Rabobank, Robeco’s former owner – has also resigned.

Both Steyn and Bruggink have taken up new positions at Orix.

Steyn succeeded Roderick Munsters – former CIO at the €372bn Dutch civil service pension fund ABP – who left Robeco in September last year and has been appointed chief executive for asset management at the Edmond de Rothschild Group.

Van Hassel has more than 30 years’ experience in the financial services industry, mainly in asset and wealth management.

Between 2009 and 2013, he served as global chief executive at ING Investment Management, now NN Investment Partners.

He also held various executive positions in Europe, Asia and the US at JPMorgan.

Jeroen Kremers, chairman of Robeco’s supervisory board, praised Van Hassel’s “deep understanding” of the asset management business and his “truly global outlook”.

Robeco Group has €269bn in asset under management, nearly half of which is on behalf of institutional investors.