Since then, the 6 foot 3, roughly 230 lb Greenberg has fought as a heavyweight from his new base of Finchley, England. Greenberg has remained undefeated at 27-0 (as of January, 2008) and is fighting his way up the food chain of the heavyweight division. In fact, he, along with Dmitriy Salita and Yuri Foreman, are the three top Jewish prospects in boxing today.
As he has not yet fought anyone in the top tiers of the boxing ranks his toughest battles are probably yet to come. Although he's displayed plenty of heart, such as when in his 2003 fight against Latvian, Mendauga Kulikauskas, he was knocked down in the 2nd round for the first time in his career, only to come back and knock him out in the 5th.
On March 18, 2006, Greenberg won the IBO Intercontinental Championship with a 6th round TKO against Alex Vassilev, and followed that with another 6th round knockout of Russia's Alexei Varakin on November 4th of the same year in Monte Carlo.
Although in today's heavyweight scene he's considered somewhat small, Greenberg has established a reputation for having very fast foot speed and extremely quick hands. In fact, legendary trainer Angelo Dundee described him as, "the fastest big guy since Muhammad Ali." He fights in the orthodox stance and is his style is often described as "cerebral," "flashy" and "patient."
Greenberg wears a Star of David on his shorts as a display of pride for his Jewish heritage. He is also a major supporter of the State of Israel. Although he trains and fights out of England, he still considers Israel to be his home.
To date there has never been a Jewish heavyweight champion of the world. Greenberg eventually hopes to fight top heavyweight Wladimir Klitscho (also Soviet-born).
In August 2008, Greenberg lost his first fight by a shocking 2nd round knockout to fellow contender Cedric Boswell. His record now stands at 27 and 0.