Stephenson was involved with Image Comics during its formative years, having learned about plans for the new company from co-founder Jim Valentino months before it was announced. In the 1990s, he was the editor for Rob Liefeld's Extreme Studios and writer or co-writer for significant runs of Bloodstrike, Brigade, New Men, Supreme, Team Youngblood, and Youngblood. With Rob Liefeld, he co-created Psilence.
