Walt Scacchi is senior research scientist and emeritus research faculty member in the Institute for Software Research at University of California, Irvine. He also serves as Principal Scientist at Investable Games Technologies, Inc. He received a Ph.D. in Information and Computer Science at UC Irvine in 1981. From 1981-1998, he was a professor at the University of Southern California. Dr. Scacchi returned to UC Irvine in 1999. His research interests include computer game culture and technology, virtual worlds for modeling and simulating complex socio-technical processes, software acquisition, and secure open architecture systems. Dr. Scacchi is an active researcher with more than 200 research publications, and has directed more than 70 externally funded research projects. He has given more than 200 invited presentations world-wide, including 17 keynote addresses and 7 tutorials. He also has had numerous consulting and visiting scientist positions with more than 40 firms or institutes, including five start-up ventures.