Doctor of Philosophy, University London, 1998.
Assistant professor linguistics and education Teachers College, Columbia University, New York City, 1999—2001, associate professor linguistics and education, since 2002.
Member of International Teachers English to Speakers Other Languages Association (chair research interest section 2003-2004, Certified of Appreciation 2004, Heinle and Heinle Distinguished Research award 2003), American Association for Applied Linguistics.
Married Gang Bao, September 2, 1985. 1 child Amy BaoHan.