Andrew Lewis was born on December 11, 1970 in Georgetown, Guyana and had numerous successes as an amateur boxer and represented Guyana in both local and international competition. Lewis a southpaw, was a destroyer inside the ring, dismantling opponents with power in either hand, he turned pro in 1993 and would go 8-0-1 in his first nine bouts, all by KO. All of these bouts were in Guyana and Lewis knew he had to step into the international arena in order to make a name for himself in the sport of boxing.
Lewis got his nickname “Six Heads” in an amateur tournament in Georgetown when he was 7. He recalled, ”I knocked the other boy down twice in the first round and two more times in the second round.”  ”When he got up, the referee asked if he wanted to continue. He said: ‘I’m fighting no more. I see six heads in front of me.’ That’s how I got the name Six Heads, and the name stuck.”
Lewis relocated to Brooklyn, NY in 1996 and continued his streak of knockouts, winning his next 12 bouts over the next four years, 11 by KO.
On a HBO Boxing After Dark doubleheader on February 17, 2001  Lewis met former welterweight champion James Page.  Lewis won by TKO after Page was knocked down twice and the referee called a halt to the fight. Lewis became the WBA World Welterweight Champion
HBO then had Lewis on the air for the boxing series titled “KO Nation where he won a 12 round unanimous decison over Larry Marks.
Lewis then met relatively unknown Nicaraugan challenger Ricardo Mayorga on July 28, 2001 at the Staples Center in Los Angeles on a Pay-Per-View” card with Roy Jones against Julio Gonzalez. The referee stopped the fight in the second round after Lewis sustained a bad cut over his eye from a clash of heads. The fight was ruled a no contest.
Lewis and Mayorga would meet again nine months later in Reading, PA. It was an exciting fight for the first four rounds during which Lewis opted to slug more with Mayorga, which was more of Mayorga’s fight. In the fifth round, Mayorga landed a hard left hook followed by another left and right that put “Six Heads” down on his back. He was able to get up, however didn’t respond to referee Rudy Battle when he asked if he could continue; therefore the fight was stopped.
He rebounded with a first round KO eight months later on November 22, 2002 against Oscar Delgado of Mexico, which put him back in line for another title shot, however he was stopped by WBO Welterweight champion Antonio Margarito in two rounds in February of 2003. Lewis would be out of the ring for 2 1/2 years and returned to his home country of Guyana and had a series of fights with fellow countryman Denny Dalton. Their first encounter in October 2005 ended in a technical draw.
In the rematch sixth months later, Lewis was leading on all cards up until the seventh round, when he began to complain of bowel issues in which he needed to go to the bathroom; therefore the fight was stopped. He would avenge the loss a year later in a 12 round decision win. Lewis fought for the last time 2008, losing a 12 round split decision to Howard Eastman.
Lewis’s record as a professional stands at 23-4-2 with 20 KO’s.