Bryan Costales has been involved with sendmail for over fifteen years and is author of the O'Reilly sendmail book (the "bat" book). He has also written books about C-language programming and Unix communications. He currently lives in the San Francisco Bay area with his dog, a fine German shepard named Java.
Marcia Flynt has been involved in software engineering for over twenty-five years and has managed the email development for opt-in custom email businesses. She lives in Boulder, Colorado, with her husband and two children.