Fergus Millar is a professor at the Oriental Institute at Oxford University. Many of his lectures and essays are published in book form.
I greatly enjoyed The Crowd in Rome in the Late Republic (Thomas Spencer Jerome Lectures), a study of the influence of the Assembly on the political decision making process in the Late Republic, attempting to demonstrate that the Senate had less power, and that Rome was more "democratic," than is generally claimed. He makes a convincing argument for his theory, although I'm certain this is not the last word on the subject.
Among his books is a three-part collection of lectures and writings, Rome, the Greek World, and the East:
I cannot find Volume 3: "The Greek World, the Jews and the East," anywhere. It may not yet have been published.
This all came to mind when I came across this article in JSTOR, relating to our current chat subject: The Political Character of the Classical Roman Republic, 200-151 B.C., Fergus Millar, Journal of Roman Studies, Vol. 74, 1984 (1984) , pp. 1-19, which can also be found as an updated version in print in Volume 1 above. It could well be subtitled: "Polybius was right and his modern critics are wrong."
Check with your university or public library for JSTOR access.