Who is T.A. Sinclair from The Politics of Aristotle and what is their importance?

This man is the translator of this edition of Aristotle's Politics. During his lifetime he served students and faculty members as a lecturer, Dean and quite possibly also researcher. He taught in England at three universities. He was a Fellow at Cambridge, from which he graduated. He also taught at Southhampton and Birbeck, and at the well reputed Queen's College in Belfast, Ireland. There he was a professor of Greek. He is the author of one of the introductions in this edition of the book. He died in 1961.