He, along with fellow Utilitarian Charles Hay Cameron had been responsible for the Colebrooke-Cameron Commission report, which brought constitutional government to Sri Lanka and marks the beginning of the modern era in that country.
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In 1850, Trevelyan campaigned along with Charles Hay Cameron for the opening of the Indian Civil Service to the native population and championed the appointment of Soorjo Coomar Goodeve Chuckerbutty to the Bengal medical service.