Yossarian has been a software developer at Electronic Arts in Vancouver, Canada since 1995, working first in the central tools and libraries team (Saturn, 3DO, Nintendo 64) and then on the FIFA series (FIFA 98 for Nintendo 64, 99-2002 for PC, 2003 multi-platform) then back onto central teams. As of 2009 he is the technical director for the central art tools team at EA's Burnaby studio, leading about 15 developers building content creation and asset management tools.

Yossarian received a B.Sc. in Computing Science from Dalhousie University in 1990, and a Masters in computer vision in 1993 from the University of British Columbia.

In his spare time he plays ultimate, hangs out with his kids, and rides a unicycle.