Before finishing his career in April 2005 orthodox boxer Jefferson built up a record of 28 wins, 1 draws, and 4 losses, starting at age 27 on June 1995 and ending 9 years later at . Jefferson's longest KO streak is 10 fights long out of his 33 pro career fights.
Starting as he means to go on, Jefferson got off to an explosive start in his debut, defeating Terrence Holley in 1 rounds and becoming the only person to have stopped Holley to date. Continuing on from his debut, Jefferson had an impressive start to his career as he went on to fight 18 fights including 3 times in 1996, 3 times in 1997 and 7 times through 1998 and 1999 against fighters such as Jeff Lally, Obed Sullivan and Bert Cooper.
On January 15th, 2000, Jefferson took on and was defeated by David Izon meaning his career tally went to 22-1-1. Jefferson was beaten by David Izon in the 9th round. The win came via TKO in the 9th round.
Taking another knock in his career, Oleg Maskaev was next in line for Jefferson with Maskaev coming out victorious. Jefferson career was at 22-2-1 following the fight. Jefferson was beaten by Oleg Maskaev in the 4th round. Jefferson had only ever been stopped 2 times previously in his career. Taking his record to 23-2-1. Jefferson then went on to win his next fight against Marcus Johnson.
Jefferson's next defeat of his career came against Wladimir Klitschko on March 24th, 2001 taking his career record to 23-3-1. Jefferson failed to go into the later rounds with Klitschko, with Klitschko stopping him in the 2nd round and becoming the 3rd person to stop Jefferson. Jefferson then went on to win a further 3 fights taking his record to 26 wins, 3 losses and 1 draws.
Pushing his career further, Jefferson fought Julius Long on February 27th, 2004 adding to his winning record. Jefferson was the 3rd person to go the distance with Long. Jefferson fought Julius Long in 2004, the result was via TD. Jefferson then went on to face Ed White where he added another win to his tally.
Jefferson went into his next fight against Davarryl Williamson on April 30th, 2005 with a career record of 28 wins. This turned out to be Jefferson's last career fight, bringing Jefferson's 33 fight career to an end on November 22nd, 2018. Williamson was too much for Jefferson and became the 4th person to stop him.