Pierre Baldi is Professor of Information and Computer Science and of Biological Chemistry (College of Medicine) and Director of the Institute for Genomics and Bioinformatics at the University of California, Irvine.
A bit biased since I did my master's thesis at Center for Biological Sequence Analysis, the lab headed by one of the authors. That said, this is a fantastic book. Focus is on sequence (DNA, RNA, protein) bioinformatics and a must-read if you are active in that field. I would also go so far as to say that it is a great book on bayesian methods and machine learning in general and can be read by someone not active in bioinformatics. Highly recommended.