As a result , by age 21 , Robertson landed his first work for a major publisher illustrating Justice League Quarterly # 4 at DC Comics .
After Robertson launched his career with Space Beaver , he began to regularly attend comic conventions seeking advice and professional connections .
By age 21 , Robertson landed Robertson 's first work for a major publisher illustrating Justice League Quarterly # 4 at DC Comics .
After Robertson launched his career with Space Beaver , he began to regularly attend comic conventions seeking advice and professional connections .