Mark Petrovic is technologist and software developer. He started at AT&T Technologies in 1984 as a semiconductor engineer, returned to graduate school thereafter, and received a Ph.D. in physics in 1991. He was Visiting Scientist at IBM Thomas J. Watson Research Center in Yorktown Heights, NY, where he did optical studies of semiconductors and laser materials. In 1996, he was first in Sprint Internet Passport Operations and subsequently led that group during the company's build-out of its national consumer Internet service. Most recently he served as Internet Architect followed by Vice President Research and Development at EarthLink, where he incubated the company's SIP based voice service and IPv6 to-the-home. Mark has contributed to a number of open source projects, including JXTA Commons and UCL vic. He lives and works in the San Franciso Bay Area.