Who is Macgregor from Burmese Days and what is their importance?

Macgregor, born in 1882, is the local Deputy Commissioner and also the Secretary of the European Club. As such, he is simultaneously the political and social leader of the English community. He is forty-three years old and wears a silk suit over his large and heavy body. He habitually thrusts his head forward which has gained him the nickname of "tortoise" among the Burmese.