From 1925 he studied in Heidelberg, Geneva and Berlin and from 1926 he worked for Ministry of the Interior and for the Reichskunstwart Edwin Redslob, in field of national heraldic and vexillological matters.
During the Nazi regime he received commissions from the state and municipal archives, Ministry Foreign Affairs, the Air Ministry and from Kriegsmarine, but his name could not be mentioned and his great book Flaggenbuch des Oberkommandos der Kriegsmarine was published without Neubecker's name.
After the war he lived in East Germany and here he was consulted about municipal and state heraldry, and he lectured, wrote and published many articles.
He was posthumously named a Laureate of FIAV in 1999 at the 18th International Congress of Vexillology in Victoria, British Columbia.
The complete bibliography covering his publications, radio and television programs comprises 42 pages.