By admin 
Three days after news of the agreement surfaced, Williams took to Twitter and shared some love towards the organization, its fans, and his former teammates.
To the Celtics, the city and my brothers: Thank you for your belief in me and support through all of our seasons of basketball and life. I’m beyond grateful to have been a part of this organization & will forever have love for the people that surrounded me in this experience💚☘️
“To the Celtics, the city and my brothers: Thank you for your belief in me and support through all of our seasons of basketball and life,” Williams said in a tweet. “I’m beyond grateful to have been a part of this organization & will forever have love for the people that surrounded me in this experience.
Williams signed a four year, $53 million contract as part of the move to Dallas.
The 24-year-old spent his first four NBA seasons with the Celtics, after being drafted in the first round of the 2019 NBA Draft. Over the years, he played a key role in three deep playoff runs — two the the Eastern Conference Finals and one to the NBA Finals.
Boston’s former No. 12 appeared in 288 games for the C’s, starting in 58 of them. He averaged 6.2 points, 4.6 rebounds, and 1.7 assists per game, while shooting 45.1% from the field and 37.9% from beyond the arc. Williams also made an impact on the defensive end, taking on numerous tough assignments, like Giannis Antetokounmpo and Joel Embiid.
The morning after it was announced that Williams would be playing his basketball in Dallas, The Athletic’s Jared Weiss published an exclusive interview with the man himself. Williams opened up about the free agency process, explaining that he really wasn’t sure which team he’d be suiting up for in the fall.
“This time I was packing like I’m gonna be in Boston or I’m gonna move this to a different state,” Williams told Weiss. “I was confident just because my mom did a great job helping me keep my head through it. I can only imagine if I didn’t have the support system that I have because it’s one of those when you’re stressed about what’s next, I don’t know how much money I’m gonna be making. It’s just a lot of stuff to balance.”
He went on to add that he would’ve been happy to return to the Boston Celtics, even after the Kristaps Porzingis trade, which would’ve likely left his minutes scarce.
“With the (Porziņģis) news, I was excited about it ’cause even if they did end up matching me, I would probably be playing less but my whole thing is about winning,” he continued. “But the ability to come to a great team like the Mavericks and compete at a high level, and be involved to do things to show I can really pass and do more in the future, is really exciting for me.”