The attack happened just before 5 p.m. on June 18 on the J train platform at the Delancey Street station on the Lower East Side.
Police say suspect punched and kicked the 65-year-old victim until he passed out.
That man was treated and released from an area hospital.
The suspect is described as Hispanic male in his early 20s, approximately 5-foot-7 with long hair.
Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782).