The 52-year-old taxi driver was taken to hospital with a cut and swelling to his face after being repeatedly punched in Kimpton Close, Druids Heath, at around 2pm on June 30.
Footage of the incident was circulated on social media and West Midlands Police quickly identified 39-year-old Adam Clancy as the prime suspect.
Officers have been working to bring Clancy into custody in order to question him on suspicion of what happened – but despite arrest attempts at more than seven properties, Clancy remains at large.
As a last resort, West Midlands Police officers have now issued his image to the public as part of an appeal to locate and arrest him.
Clancy is from the Stirchley area of Birmingham, and also has links to Druids Heath, Acocks Green and Bromsgrove.
Detective Sergeant Patrick Simpson, said: "To put it simply, people should not go to work fearing that they will be attacked or abused as they try to do their job.
“The taxi driver sustained injuries that required hospital treatment, and we know that many people who have seen the footage are understandably shocked and outraged at what happened – please be assured that we are determined to find who was responsible.
"I would urge anyone with information which will assist our investigation to contact us. I would also urge Adam Clancy to do the right thing and hand himself in as soon as possible."
Anyone with information on the whereabouts of Adam Clancy is urged to call West Midlands Police on 101, quoting crime reference number 20BW/151488Q/20. Alternatively, call Crimestoppers anonymously on 0800 555111.
If you see Adam Clancy, the public are asked not to approach him and call 999 immediately.