Investigators are looking for 22-year old Tyler Simmerman.
They say he attacked a 69-year old man on Thursday night on Saint Paul Avenue.
The suspect approached him, assaulted him, and took his iPhone.
The victim was taken to Jacobi Hospital, where he is listed in critical but stable condition.
Anyone with information in regards to this robbery is asked to call the NYPD's Crime Stoppers Hotline at 800-577-TIPS.