Jackson initially attended Carencro High School in Lafayette, Louisiana until 2007 where his father was the head coach of the football team There, Jackson honed his skills as a corner under his father"s tutelage. After his father returned to McNeese State, Jackson attended Alfred M. Barbe High School in Lake Charles, Louisiana, where he made 92 tackles and intercepted 5 passes as a senior.
After playing college football for McNeese State, he was signed by the New York Giants as an undrafted free agent in 2012. After totaling 93 tackles, 5 interceptions and blocking seven kicks as a junior, he was named Class 5A All-State by the LSWA. He was also named Class 5A All-State a second time and received All-American honors by United States of America Today and SuperPrep. In addition, Jackson participated in the United States. Army All-American Bowl.
Considered a five-star recruit by Rivals.com, Jackson was listed as Number.
2 cornerback in the 2009 class. He originally committed to Louisiana State University on February 23, 2008, but rethought his choice on National Signing Day 2009, when he signed a national letter of intent to play football for Tennessee.
Said Jackson: "Monte Kiffin was the difference. I love Tennessee. I have known Coach Orgeron for a while and I love him.
But to realize that if you play defense at Tennessee, then you are going to know what Monte Kiffin knows is special.
He invented his own defense (Tampa 2) and has been so good for so long, and now he is going to teach me what he knows. That was just too much to pass up."
Despite Tennessee"s depth in the defensive backfield, Jackson was expected to contribute as a true freshman in 2009. He arrived at Tennessee weighing 175 lbs, but bulked up to 192 lbs.
According to head coach Lane Kiffin, Jackson "already covers like an Securities and Exchange Commission cornerback and hits like an Securities and Exchange Commission safety and has a chance to lineup alongside Eric Berry as a starter on September 5 against Western Kentucky."
Until midseason, Jackson had started all but two of the Volunteers" games and had emerged as one of the better freshman players in the Southeastern Conference (Securities and Exchange Commission).
He was suspended for the week 9 game against Memphis for violating team rules. On November 12, 2009, Jackson and fellow freshmen teammates Mike Edwards and Nu"Keese Richardson were arrested after an armed robbery attempt at a Pilot station on Cumberland Avenue in Knoxville, Tennessee.
Less than two weeks later, charges against Jackson were dropped because a police investigation found that he had no prior knowledge of the alleged attempted robbery. On November 24, he was reinstated to the Tennessee football team
On August 24, 2011, the University of Tennessee announced that Janzen Jackson was released from the football team for unspecified reasons.
On August 28, Jackson enrolled at McNeese State University, where his father Lance Guidry played and coached for the McNeese State Cowboys football team 2012 NFL Combine
New York Giants
On April 29, 2012, Jackson signed with the New York Giants as an undrafted free agent. On August 13, 2012, Jackson was waived by the team
Toronto Argonauts
On February 21, 2013, Jackson signed with the Toronto Argonauts of the Canadian Football League.
Jackson has a son named Ethan.
As a sophomore in 2010, Jackson started all 12 regular season games and compiled 65 tackles, 4 tackles for loss, a sack, 9 passes defended and 5 interceptions and was named to the All-Securities and Exchange Commission second team voted by the league"s coaches.
