Tom Sater joins the RO Group from Clean Energy Capital

Maida Zahirovic is head of renewables at James Fisher & Sons

CEO Joseph Oh and Co-CEO Henrik Olesen have stepped down from respective roles citing personal reasons

Kevin Kroll has taken up the position in the German developer’s American renewables business

Turbine maker will be integrated into the group’s management structure under new chief executive

Arthouros Zervos set up the trade body in 2005 and went on to steer PPC through the Greek financial crisis