Andy Duncan is the coauthor of Oracle & Open Source (O'Reilly, 2001), as well as Perl for Oracle DBAs (O'Reilly, 2002). The first book arose after Andy's creation, in 1998, of the Orac Perl/Tk tool for Oracle DBAs. Since then, he has worked mainly as an independent development and DBA consultant, and has counted both Oracle Corporation and Sun Microsystems among his long-term clients. In addition to performing Oracle, Perl, and Java consultancy work, Andy teaches as a senior instructor for Learning Tree International, covering both introductory and advanced Perl courses. He lives in Oxfordshire, England.

Sean Hull is an Oracle DBA and web developer plying his trade as an independent consultant with his own firm, iHeavy Inc., in New York City. He focuses on integrating open source technologies with commercial technologies such as Oracle, and has serviced many successful Silicon Alley companies. His practice is growing steadily with an expanding network of associates offering a wide range of database, web, and Internet-related services. He is the author of Karma, a web-based open source Oracle monitoring tool, and a major contributor to the Orac DBA tool. He also contributes to the telelists Oracle email list and the dbi-users email list. On his days off, you might find him practicing Capoeira, a Brazilian martial art. He resides in Manhattan, where he enjoys the fast pace, great restaurants, culture, and art. He can be reached at shull@iheavy.com.