Dr Badian died a few days ago and obituaries still haven’t appeared; the closest seems to be from Harvard’s Faculty page, which seems to have added a line noting his passing:
Ernst Badian was Professor of History 1971-82 and John Moors Cabot Professor of History 1982-98. He passed away on February 1, 2011, at the age of 85. A private funeral was held on February 3, in Brookline, MA, and information about a memorial service at Harvard University will be posted in the coming weeks.
Professor Badian received a B.A. in 1945 and an M.A. in 1946 from Canterbury University College, New Zealand; also a B.A. (First Class in Litt. Hum.) in 1950, an M.A. in 1954, a D. Phil. in 1956 from Oxford University, a Litt. D. from Victoria University in New Zealand in 1962, an Hon. Litt. D. from Macquarie University in Sydney in 1993, and an Hon. Litt. D. from the University of Canterbury in 1999. In 1999 he was decorated with the Cross of Honor for Science and Art by the Republic of Austria.
His publications included Foreign Clientelae 264-70 B.C. (Charendon Press, Oxford, 1958); Studies in Greek and Roman History(Blackwell, Oxford, 1964); Roman Imperialism in the Late Republic, 2nd ed. (1st commercial ed.) (Blackwell, Oxford/Cornell Univ. Press, 1968); Publicans and Sinners (Blackwell, Oxford/Cornell Univ. Press, 1972, reprinted, with corrections and critical bibliography, Cornell Univ. Press, 1983); From Plataea to Potidaea (Johns Hopkins Univ. Press, 1993); Zöllner und Sünder (Wissenschaftliche Buchgesellschaft, Darmstadt, 1997).
He wrote about 200 articles in journals and composite volumes, plus contributions to encyclopaedias, etc. He edited a number of books, including Ancient Society and Institutions. Studies Presented to Victor Ehrenberg (Blackwell, Oxford, 1966); Polybius. Selected passages in translation, with an introduction of 12,000 words (Washington Square Press, NY, 1966); Sir Ronald Syme, Roman Papers (vols. 1 & 2) (Oxford Univ. Press, 1979); Translated Documents of Greek and Rome, vols. 1, 2, 3, edited jointly with Robert K. Sherk (Johns Hopkins Univ. Press, then Cambridge Univ. Press; various dates).
He was the founder and, until 2001, the editor of The American Journal of Ancient History. He also founded the Association of Ancient Historians and the New England Ancient History Colloquium.
He was a Fellow of the British Academy; Fellow of the American Academy of Arts and Sciences; Fellow of the American Numismatic Society; Honorary Fellow of University College, Oxford; Corresponding Member of the Austrian Academy of Sciences; Corresponding Member of the German Archaeological Institute; Foreign Member of the Finnish Academy of Sciences; Honorary Member of the Roman Society (London).