After graduation, he worked for five years as a Research Scientist for Bell Communications Research in Morristown, New Jersey, he joined the University of Illinois, where he is currently Professor in the Department of Electrical and Computer Engineering, Research Professor in the Coordinated Science Laboratory, faculty member in the Beckman Institute's Image Formation and Processing Group, and Affiliate Professor in the Department of Statistics. He is also a member of the Information Trust Institute and the founding director of the Center for Information Forensics, a multidisciplinary research center currently involving twenty colleagues.
His fields of professional interests are information theory, image and video processing, statistical signal processing and modeling, decision theory, information hiding and authentication, the application of multiresolution signal analysis, optimization theory, and fast algorithms to these areas.
He served as Associate Editor for the IEEE Transactions on Information Theory from 1996 till 1998, for the IEEE Transactions on Image Processing from 1999 till 2002, and then as Area Editor from 2002 till 2006. He is co-founder and Editor-in-Chief of the new IEEE Transactions on Information Forensics and Security.
He is a fellow of IEEE and member of the Board of Governors of the IEEE Signal processing Society. He has received a 1997 Career award from the National Science Foundation, and the IEEE Signal Processing Society 1997 Best Paper award in the IMDSP area. He is also co-author (with Juan Liu) of a paper that received the IEEE Signal Processing Society 2002 Young Author Best Paper award in the IMDSP area. He was selected as 2003 Beckman Associate of UIUC's Center for Advanced Study and was awarded the 2005 Sony Faculty Scholar Award. In 1996, 1999, 2000 and 2005, he was on the Dean's list of teachers rated excellent by their students.