Harrington, who was the Indian Pacers' first-round pick in the 1998 NBA draft, opted to go straight from high school to the NBA.
As a result of this, he is one of only five NBA players to have played more than 15 seasons .The other four members of this club are Kevin Garnett, Kobe Bryant, Jermaine O'Neal and Rashard Lewis.
"I'm very happy with what I was able to accomplish," Harrington told the Denver Post. "I was able to change a lot of people's lives in my family, including myself, in a game that I eventually fell in love with and will always be in love with. And hopefully, I can stay around the game until I die.
"It was a fun ride. It went by fast, too. It was like one minute I was 18, the next I was 25, then was 30 and now I'm 35. It was a fun run. Met a lot of great people."
During his illustrious NBA career, Harrington played for seven different teams and averaged 13.5 points, 5.6 rebounds and 1.7 assists per game.
Harrington was looking to make his NBA comeback after opting to play in China last year, but that dream was derailed due to his lingering knee issues.
However, with his playing career having come to an end, Harrington has already taken a step in the coaching direction as he will help out the Denver Nuggets for the rest of the ongoing season after head coach Brian Shaw was fired on March 3.