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He will also join Savannah's audit and risk committee, as well as the remuneration committee.
Leahy has been involved in financial services for over 32 years and brings to the table an extensive knowledge of capital markets with a specialisation in commodities.
After starting his career at the London Metal Exchange, he moved on to work at James Capel, Credit Lyonnais, Nedbank, Canaccord and Mirabaud.
He is currently director of Geiger Counter and Energy Minerals Investments, as well as chairman of The Judd School in Kent.
Leahy was previously interim chairman at Bacanora Minerals and served on a number of other boards and their various committees.