Costas Miranthis, the former Partner Re president and CEO, has been appointed as an independent non-executive director to the group board of RiverStone International, the acquirer and reinsurer of legacy and discontinued insurance business.

Mr Miranthis brings significant experience in underwriting and actuarial roles and strong leadership experience that will support RiverStone International’s expansion, the firm said.

He also serves on the boards of Hiscox, the Argus Group and Pacific Life Re as an independent non-executive director.

Mr Miranthis was president and CEO of Partner Re from 2011 until 2015.

RiverStone also announced the appointment of Neil Taylor as the group chief investment officer.

Mr Taylor spent 11 years at Catalina, the non-life run-off specialist insurer, as the European chief investment officer, responsible for all of Catalina’s regulated insurance entities in the region.

Operating in the UK company and Lloyd’s of London markets, RiverStone International said that it has transacted a wide variety of deals — from insurance and reinsurance portfolio transfers to company purchases, acquiring more than $7 billion of liabilities since 2010 and with about $4 billion of liabilities currently under management.