Ahilan takes up his new post in mid-October in a move from GL Noble Denton, the GL Group's oil and gas division. He will also run its third-party certification body GL Renewables Certification.
Garrad – who co-founded the Garrad Hassan consultancy in 1984 – will become non-executive chairman of GL Group’s renewable energy division, with a focus on strategy.
GL Garrad Hassan was formed in 2009 when the UK consultancy merged with German consulting and engineering giant Germanischer Lloyd.
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