Tax Prof David Hasen (Penn State), formerly of Michigan and the 2008-09 IRS Office of Chief Counsel Professor in Residence, has accepted a permanent position at Santa Clara. From his Penn State web page:

Professor Hasen's principal areas of teaching and research interest are taxation, jurisprudence, administrative law, and contracts. His current research projects include an examination of legal transition relief, the taxation of financial products, and the concept of neutrality in international taxation. Professor Hasen is also interested in expanding access of the poor to legal services and in using the law to promote social justice.