[jiraaya]

I have seen so much of these posts that I am now only willing to take opinions on languages from people who do actual research / develop a language that is popular. Anyways I think this is an opinionated post that one can choose to reject if one needs to. The article is very vague at the least.

[HillRat]

Well, Professor Nierstrasz has been doing language research since the early 1980s with a particular focus on object-oriented and concurrent OO paradigms, so he definitely fits your requirements. This should be taken for what it is -- a breezy, somewhat exasperated tour of where OO hasn't lived up to its (often rather handwavy) promises, from a researcher who has spent his career trying to improve the theoretical and practical state of the art.