A surveillance camera captured the fight. Video released by police shows the man identified as Viet Dam and the victim briefly exchanging punches.
The victim survived and has since been released from the hospital, Washington said.
Police described the suspect as a Chamblee resident, but his whereabouts are unknown.
Anyone with information about Dam is asked to contact Gwinnett detectives at 770-513-5300. Tipsters can also remain anonymous — and be eligible for rewards of up to $2,000 — by visiting crimestoppersatlanta.org, calling 404-577-8477 or texting information to 274637.